01 a. Not perceptible; not to be apprehended or cognized by the senses; not discernible by the mind; not easily apprehended.
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1.
Not perceptible; not to be apprehended or cognized by the senses; not discernible by the mind; not easily apprehended.“Almost imperceptible to the touch.” — Dryden.“Its operation is slow, and in some cases almost imperceptible.” — Burke.“Their . . . subtilty and imperceptibleness.” — Sir M. Hale.