Definition of undetectable in US English:



  • Not able to be detected.

    • ‘And there's another sound, too: a low, whispering rumble, almost undetectable.’
    • ‘The company claims this process takes just microseconds, making lag undetectable.’
    • ‘An isolated black hole is, of course, undetectable, except by its gravitational pull - the way it distorts space in its vicinity.’
    • ‘Both believed they were using an undetectable drug and would never be caught.’
    • ‘He shrugged, and his eyes glimmered slightly with an undetectable sadness.’
    • ‘Further, if they are undetectable by their taste, smell, or colour their attractiveness as poisons is enhanced.’
    • ‘The extra risk of developing cancer from low doses of ionising radiation is so small that it is undetectable in the population.’
    • ‘It can often be dissolved in a drink and is undetectable.’
    • ‘Then, slightly with a barely undetectable motion, she ran her fingertips across his neck.’
    • ‘In four months of observation, this orbital movement would be so slight as to be undetectable from Earth.’
    • ‘His eyes met mine in the rearview mirror… and lingered there, casting me a small undetectable smile.’
    • ‘Carbon monoxide is undetectable by the human senses: it is colourless, odourless, and tasteless.’
    • ‘Even if such a phenomenon were to exist, it would generally be considered to be undetectable by available statistical methods.’
    • ‘Rootkits are the ultimate backdoor, giving hackers ongoing and virtually undetectable access to the systems they exploit.’
    • ‘Harmless and humane, the cats simply don't like the sound, which is undetectable to the human ear.’
    • ‘In doing so, he introduced an almost totally undetectable back door into the system’
    • ‘The word on the street is the drug dealer is about to import a huge quantity of altered cocaine that is undetectable to drug sniffer dogs.’
    • ‘I was beginning to get a little carsick, when we stopped with a slightly, almost undetectable, jerk.’
    • ‘‘You could have fraud on a scale never seen before, and it will be completely undetectable,’ he said.’
    • ‘He didn't hear what the soldier said, it was in a low whisper that was undetectable from his position in the room.’
    unnoticeable, imperceptible, invisible, inaudible, odorless, subtle, faint, obscure
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