imperceptible








adjective

  1. very slight, gradual, or subtle: the imperceptible slope of the road.
  2. not perceptible; not perceived by or affecting the senses.

noun

  1. something not capable of being perceived by the senses: metaphysical speculation about imperceptibles.

adjective

  1. too slight, subtle, gradual, etc, to be perceived
adj.

early 15c., from French imperceptible (early 15c.), from Medieval Latin imperceptibilis, from assimilated form of in- “not, opposite of” (see in- (1)) + perceptibilis (see perceptible). Related: Imperceptibly. OED marks imperceivable as “Now rare.”

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