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impalpable (adj.)

c. 1500, "too unsubstantial to be perceived by touch," from French impalpable or directly from Medieval Latin impalpabilis, from assimilated form of in- "not, opposite of" (see in- (1)) + palpabilis (see palpable). Figurative (mental) sense of "that cannot be grasped by the intellect" is from 1774. Related: Impalpably; impalpability.

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Definitions of impalpable from WordNet

impalpable (adj.)
incapable of being perceived by the senses especially the sense of touch; "the intangible constituent of energy"- James Jeans;
Synonyms: intangible
impalpable (adj.)
imperceptible to the senses or the mind;
as impalpable as a dream
impalpable distinctions
an impalpable cloud
impalpable shadows
impalpable (adj.)
not perceptible to the touch;
an impalpable pulse
From wordnet.princeton.edu