imperceptible

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im|per|cep|tible /'ɪmpərs'eptɪbəl/
[ADJ]
Something that is imperceptible is so small that it is not noticed or cannot be seen.
Brian's hesitation was almost imperceptible.
● imperceptibly [ADV] usu ADV with v, also ADV adj
The disease develops gradually and imperceptibly.

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