Definition of falsify in English:



[with object]
  • 1Alter (information, a document, or evidence) so as to mislead.

    ‘a laboratory which was alleged to have falsified test results’
    • ‘The students were selected on the basis of their character and were not compensated for their efforts so falsifying or intentionally providing inaccurate data should be considered unlikely.’
    • ‘Shipman had falsified his records to create bogus medical histories to explain away the sudden deaths of his victims.’
    • ‘These sorts of assertions are good because they are hard to falsify.’
    • ‘Best also said he had falsified two other case reports at the direction of the 31-year-old Auner during his stint with the training officer.’
    • ‘Apparently, the competition to get into the Haas School of Business at UC Berkeley is so fierce that applicants falsified schooling, job information, and other items in order to gain admission.’
    • ‘It was called following allegations that in one ward alone, 3,000 out of 7,000 postal codes were stolen, altered or falsified during last year's local elections.’
    • ‘The fact that falsified, erroneous reports made it into the pages of the Times demonstrates a flawed editorial process and a severe lapse in judgment from management.’
    • ‘The defendant is also alleged to have falsified an accounting document on a loan facility in August 1996.’
    • ‘He cites evidence that doctors or medics falsified death certificates to cover up homicides.’
    • ‘An even higher level that has to be considered in the attack planning and implementation is the effect on the adversary's decisions of blocking, degrading, falsifying, or inserting the sensor information.’
    • ‘Without blogs and other Internet media, this rumor would have just festered - because of blogs, these accusations got quickly aired and quickly falsified.’
    • ‘Marx not only omitted facts which ran counter to his theories, but also was guilty of distorting, falsifying, and misquoting information which contradicted his contentions.’
    • ‘A complaint cannot be filed or properly pursued if key evidence has been withheld or even falsified.’
    • ‘However, in my view evidence concerning the motive or lack of motive in the complainant for falsifying her complaint is admissible not only in relation to her credit but also in relation to the facts-in-issue in the case.’
    • ‘The information we had about weapons of mass destruction in Iraq was exaggerated or falsified.’
    • ‘While Furtado pleaded guilty to falsifying a declaration for a marriage certificate, Fulgencio denied the same charge and faced trial yesterday.’
    • ‘He was said to have deliberately falsified a document to increase his salary and backdate his pension.’
    • ‘After finding an unqualified buyer, they'd falsify mortgage applications and employment histories just to get a bank to say yes to a loan.’
    • ‘No interest is served when it's easy to duplicate or falsify an identity document.’
    • ‘On 5 January 1996 the police reportedly used his thumb prints to falsify a statement in which he apparently confirmed that his injuries resulted from a fall while he was in the Civil Hospital, soon after he was first examined.’
    • ‘He falsified the medical records of Hazel Wood when she died of serious heart disease because three months earlier he attributed her chest pains to stomach problems.’
    • ‘The women had their passports taken from them and made to sign a blank piece of paper, later used to falsify work-related documents.’
    • ‘Thousands of unwitting South African women may be married illegally to foreigners who have paid corrupt officials to falsify marriage certificates.’
    • ‘One senior investigator was found by the three judges to have falsified statements attributed to Murphy.’
    • ‘It was clear that he had covered his tracks by altering records and falsifying death certificates.’
    • ‘Identifying details should be omitted if they are not essential, but patient data should never be altered or falsified in an attempt to attain anonymity.’
    • ‘When I called Morris and asked for the adoption specialist, he told me we were turned down because we had falsified the application.’
    • ‘Its total contribution on the gun issue is not an argument about guns, but a personal - indeed a personal, vicious, and falsified - attack on Heston and the NRA as a group.’
    • ‘Lynn Geldof told reporters the detection of child trafficking was complicated by the fact that many traffickers are women who falsify documents so as to pose as the children's mothers.’
    • ‘Threats to integrity may include a request to deceive a patient, to withhold information, or to falsify records, as well as verbal abuse from patients and coworkers.’
    • ‘He was sentenced to 15 months in jail for falsifying his identity documents to get a passport to go to Pakistan.’
    • ‘There is now some speculation that the allegations were falsified by Phil Weaver.’
    • ‘He is also charged with falsifying an accounting document for September 1997 at Matbro contrary to the Theft Act.’
    • ‘I have in my possession documents including receipts, log-sheets, etc. which have been altered and falsified so as to give the impression that everything is in order and in accordance with the quotas.’
    • ‘He has already been charged with falsifying documents which showed transfer credits totalling over $40m from a bank he owned in Belgrade to an Irish company.’
    • ‘The central bank said it would punish banks which helped businesses to falsify documents regarding their overseas remissions.’
    • ‘Are these legitimate defectors or are they deliberately out there falsifying testimony?’
    • ‘He was arrested July 19 at the McAllen airport and charged four days later with illegal entry into the US, falsifying information and falsifying a passport.’
    • ‘A doctor yesterday branded as ‘preposterous’ accusations that he falsified an application for a job at a leading Yorkshire hospital.’
    • ‘Tribunal lawyers introduced further invoices from a company based in the Czech Republic yesterday to support their theory that he regularly falsified records to conceal the proceeds of property deals in Ireland.’
    forge, fake, counterfeit, fabricate, invent, alter, change, doctor, tamper with, fudge, manipulate, massage, adulterate, pervert, corrupt, debase, misrepresent, misreport, distort, warp, embellish, embroider, colour, put a spin on
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  • 2Prove (a statement or theory) to be false.

    ‘the hypothesis is falsified by the evidence’
    • ‘It is true, as Rennie states, that Karl Popper's work on falsifying scientific theory has been superseded by other philosophies of science, but we would say that the ‘falsification approach’ is still valid.’
    • ‘Karl Popper long ago argued that empirical observations can never truly confirm a theory, they can only falsify or fail to falsify it.’
    • ‘For example, materialism and dualism are contradictory but both theories are coherent and consistent with experience, and there is no empirical event that could falsify either theory.’
    • ‘His explanation that X is not powerful evidence is interpreted as an attempt to falsify the theory.’
    • ‘When Saturn didn't move as predicted, either Newton's theory was falsified, or there was another massive object perturbing the orbit - this turned out to be the planet Uranus.’
    • ‘Among the ways in which I can falsify the assumptions on which it is based is to change my mind as the result of practical reasoning.’
    • ‘The failure to find differences in those zones would falsify the hypothesis that mountain lions partitioned space to obtain exclusive use of prey.’
    • ‘Few physicists say they are looking for ways to falsify superstring theory.’
    • ‘Given the apparent uniqueness of the north temperate zone populations of the Sedge Wren, it is important to try to falsify this hypothesis relating breeding-site fidelity and styles of song development.’
    • ‘Ruse does not claim that Christian beliefs have been falsified by evolution.’
    • ‘If history is our guide, we would expect future research to support some ideas and falsify others.’
    • ‘Therefore the Earth's eigenvibrations falsify the Inside-Out theory, but can be easily understood in terms of the Earth's spherical shape, volume and density.’
    • ‘Some researchers today do not agree that dinosaurs gave rise to birds, and are working to falsify this theory, but so far the evidence for the theory has swamped their efforts.’
    • ‘Dr. Rummel claims that my assertions are falsified in my own data.’
    • ‘Once again Dembski demonstrates that the Design Inference is one based on elimination and our ignorance by arguing that to falsify ID's hypothesis it has to show how it evolved step by step.’
    • ‘If pendulums do not behave in the way predicted by the theory, then the theory is falsified.’
    • ‘Our rejection of the alternative hypothesis of a habitat effect is based on failure to falsify the null hypothesis that winter survival among immigrants was unrelated to survival among parents.’
    • ‘Additional experiments are then performed in an attempt to falsify the theory.’
    • ‘Paup does not reproduce the phenetic clusters, and therefore the null hypothesis is falsified.’
    • ‘I've already named lots of things that could be found that would falsify evolutionary theory completely.’
    disprove, show to be false, prove unsound, refute, rebut, deny, debunk, negate, invalidate, contradict, confound, be at odds with, demolish, discredit
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    1. 2.1 Fail to fulfil (a hope, fear, or expectation)
      ‘changes falsify individual expectations’
      • ‘My learned friend reminds me that I should conclude my response to your Honour Justice McHugh's observations about falsifying the expectations of parties, or that what happened falsified someone's expectation.’
      • ‘This is because any ‘false trading’ would falsify expectations and therefore change agents evaluations of their assets.’
      • ‘Her claim in this action falsifies no legitimate assumption or expectation.’


Late Middle English (in falsify (sense 2)): from French falsifier or medieval Latin falsificare, from Latin falsificus ‘making false’, from falsus ‘false’.