I. |im+ adjective
Etymology: Middle French, from Medieval Latin imperceptibilis, from Latin in- in- (I) + Late Latin perceptibilis perceptible — more at perceptible
: not perceptible:
a. : not capable of being perceived by a sense or of affecting a sense
color is imperceptible to the touch
made an almost imperceptible gesture of assent
b. : not capable of being perceived or discriminated mentally
the difference between the two propositions was imperceptible to him
c. : extremely slight, gradual, or subtle
saw him grow up by imperceptible gradations
• im·perceptibleness “+ noun -es
• im·perceptibly “+ adverb
II. noun
( -s )
: something that is imperceptible