Longman Dictionary of Contemporary English homepage

imperceptible

 adjective
     
im‧per‧cep‧ti‧ble
almost impossible to see or notice:
Such changes are imperceptible to even the best-trained eye.
—imperceptibly adverb:
The daylight faded almost imperceptibly into night.
—imperceptibility noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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