imperceptible

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imperceptible /ˌɪmpɚˈsɛptəbəl/ adjective
imperceptible
/ˌɪmpɚˈsɛptəbəl/
adjective
Learner's definition of IMPERCEPTIBLE
[more imperceptible; most imperceptible]
: impossible to see or notice

— imperceptibly

/ˌɪmpɚˈsɛptəbli/ adverb