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English definition of “imperceptible”

imperceptible

adjective uk   /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.
imperceptibly
adverb uk   /-bli/ us    /-pɚˈsep.tə-/
Gradually, almost imperceptibly, her condition had worsened.
(Definition of imperceptible from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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