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imperceptible (adj.)

early 15c., from Medieval Latin imperceptibilis, from assimilated form of in- "not, opposite of" (see in- (1)) + perceptibilis (see perceptible). Related: Imperceptibly; imperceptibility. OED marks imperceivable (1610s) as "Now rare."

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Definitions of imperceptible from WordNet

imperceptible (adj.)
impossible or difficult to perceive by the mind or senses;
an imperceptible nod
an imperceptible drop in temperature
Synonyms: unperceivable
From wordnet.princeton.edu