imperceptible
AdjectiveUS[im-per-sep-tih-buhl]/ˌɪmpɚˈsɛptɪbəl/5 syllables
Synonyms:
unperceivable
Open English WordNet
Adjective (1)
- impossible or difficult to perceive by the mind or senses“an imperceptible drop in temperature”“an imperceptible nod”“color is unperceivable to the touch”Synonyms: unperceivableOpposite perceptibleSimilar impalpable, indiscernible, incognizable, unobservable, subliminalSee also inaudible, impalpable, invisible
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Webster's Dictionary (1913)
Im′per·cep′ti·ble adjective
Origin: Pref. im- not + perceptible: cf. F. imperceptible.
Not perceptible; not to be apprehended or cognized by the senses; not discernible by the mind; not easily apprehended.
Almost imperceptible to the touch.— John Dryden
Its operation is slow, and in some cases almost imperceptible.— Edmund Burke
— Im′wb-a2′>′per·cep′wb-a1′>′ti·ble·ness, noun — Im′wb-a2′>′per·cep′wb-a1′>′ti·bly, adverb
Their... subtilty and imperceptibleness.— Sir Matt. Hale
Webster’s Revised Unabridged Dictionary (1913), from GCIDE 0.54