1. not perceptible, not detectable, too small in magnitude to be observed
    • 1986, Derek Parfit, Reasons and Persons, OUP Oxford (ISBN 9780191622441), page 75:
      Very small benefits may be imperceptible. And it is plausible to claim that an 'imperceptible benefit' is not a benefit.
    We all missed the imperceptible shake of his head as he tried to warn us without being seen.
    Synonyms: imperceivable, undistinguishable, unperceivable
    Antonyms: detectable, perceptible

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