Meaning of “imperceptible” in the English Dictionary

"imperceptible" in British English

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imperceptibleadjective

uk /ˌɪm.pəˈsep.tə.bəl/ us /ˌɪm.pɚˈsep.tə.bəl/
imperceptibly
adverb uk /ˌɪm.pəˈsep.tə.bli/ us /ˌɪm.pɚˈsep.tə.bli/

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 emergency room, her breathing was imperceptible.
imperceptibly
adverb us /ˌɪm·pərˈsep·tə·bli/

Imperceptibly, the day grew darker.

(Definition of “imperceptible” from the Cambridge Academic Content Dictionary © Cambridge University Press)