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English definition of “imperceptible”

imperceptible

adjective     /ˌɪm.pəˈsep.tɪ.bl̩/ US  /-pɚˈsep.tə-/
unable to be noticed or felt because of being very slight: She heard a faint, almost imperceptible cry.Indistinct and invisibleExtremely smallSmall imperceptibly     /-bli/ US  /-pɚˈsep.tə-/ adverb Gradually, almost imperceptibly, her condition had worsened.Indistinct and invisible
(Definition of imperceptible adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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