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adjective
1Not logical or reasonable:
‘irrational feelings of hostility’- ‘I believe that the seemingly irrational logic of the national can still promote everyday alliances and popular mobilizations.’
- ‘Booze and cocaine corroded his sanity and left him with a legacy of irrational behaviour.’
- ‘Home values have soared to high levels in many countries as irrational exuberance grips the markets.’
- ‘By absurd, I do not mean silly, but absurd as is in the illogical or irrational.’
- ‘Australians aren't at all used to visceral and irrational hatred directed at them.’
- ‘Their hostility towards each other, however, was tangible and frequently led to quite irrational behaviour.’
- ‘The more irrational and illogical someone becomes, the more logical and incisive I become.’
- ‘The author of the piece argues that our attitude towards it is mostly irrational prejudice.’
- ‘He had a very short fuse and he could be totally irrational at times.’
- ‘I am sort of notorious for my utterly irrational fears.’
- ‘Without that insight, a supplier can encounter fewer surprises by evaluating even seemingly irrational scenarios.’
- ‘Solutions that would seem logical to us would seem totally irrational to them.’
- ‘She had never known for her daughter to be so irrational, so crazy.’
- ‘Chris smiled, sure that Seth's fears were completely irrational.’
- ‘Power sets the guidelines by which we measure what is reasonable and what is irrational.’
- ‘I have an irrational dislike of cell phones.’
- ‘Crowds and mobs are not completely irrational, but they have their own logic.’
- ‘Identify and uproot irrational beliefs that lead you to place unrealistic demands on yourself.’
- ‘If it hadn't seemed so irrational, she would have begged him not to go.’
- ‘But Delta's seemingly irrational behavior has a very logical explanation.’
unreasonable, illogical, groundless, baseless, unfounded, unjustifiable, unsoundabsurd, ridiculous, ludicrous, silly, foolish, senseless, nonsensical, laughable, idiotic, stupid, wilduntenable, implausible, unscientific, arbitrarycrazy, madbarmy, daftView synonyms- 1.1 Not endowed with the power of reason.
- ‘Man is an irrational being, morals are irrational, and have no metaphysical foundation which make them "real" or worth paying any attention to.’
- ‘Whenever you encounter a system that seems so irrational, you should ponder what's going on beneath the surface.’
2Mathematics
(of a number, quantity, or expression) not expressible as a ratio of two integers, and having an infinite and non-recurring expansion when expressed as a decimal. Examples of irrational numbers are the number π and the square root of 2.- ‘A transcendental number is an irrational number that is not a root of any polynomial equation with integer coefficients.’
- ‘The square root of 2 is an irrational number because it can't be written as a ratio of two integers.’
- ‘How can mathematical concepts like points, infinitesimally small quantities, or irrational numbers be anything but products of our minds?’
- ‘What about a seed angle derived from the golden ratio, an irrational number?’
- ‘He considered computation with irrational numbers and polynomials to be part of algebra.’
noun
MathematicsAn irrational number or quantity; a surd.
- ‘His commentary to Euclid is of interest because of its discussion of unordered irrationals.’
- ‘Eudoxus's definition of equal ratios corresponds exactly to the modern theory of irrationals.’
- ‘If we chop off an infinite cfe after a finite number of steps then we will create a rational approximation to the original irrational.’
- ‘Whether such quirks in the irregularity of irrationals have any implications for number theory remains an open question for mathematicians.’
- ‘Any finite segment can be continued to produce a rational and any finite segment can be continued to produce an irrational.’
Origin
Late Middle English: from Latin irrationalis, from in- not + rationalis (see rational).
Pronunciation:
Further reading
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