imperceptible : Dictionary / Wörterbuch (BEOLINGUS, TU Chemnitz)

English Dictionary: imperceptible	by the DICT Development Group
2 results for imperceptible
From WordNet (r) 3.0 (2006) [wn]:
imperceptible adj impossible or difficult to perceive by the mind or senses; "an imperceptible drop in temperature"; "an imperceptible nod"; "color is unperceivable to the touch" Synonym(s): imperceptible, unperceivable Antonym(s): perceptible
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Imperceptible \Im`percep"tible\, a. [Pref. im- not + perceptible: cf. F. imperceptible.] Not perceptible; not to be apprehended or cognized by the souses; 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. -- {Im`percep"tibleness}, n. -- {Im`percep"ti*bly}, adv. Their . . . subility and imperceptibleness. --Sir M. Hale.