imperceptible Meaning in the Cambridge English Dictionary
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Meaning of “imperceptible” in the English Dictionary

"imperceptible" in British English

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imperceptibleadjective

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 Learner’s Dictionary & Thesaurus © Cambridge University Press)

"imperceptible" in American English

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imperceptibleadjective [not gradable]

 us   /ˌɪm·pərˈsep·tə·bəl/
(of an ​action or ​change) so ​slight that it cannot be ​noticed: When they ​brought her in to the ​emergencyroom, her ​breathing was imperceptible.
imperceptibly
adverb  us   /ˌɪm·pərˈsep·tə·bli/
Imperceptibly, the ​daygrewdarker.
(Definition of imperceptible from the Cambridge Academic Content Dictionary © Cambridge University Press)
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