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Adjective: impalpable  im'pal-pu-bul
  1. Incapable of being perceived by the senses especially the sense of touch
    "the impalpable constituent of energy";
    - intangible
  2. Imperceptible to the senses or the mind
    "an impalpable cloud"; "impalpable shadows"; "impalpable distinctions"; "as impalpable as a dream"
  3. Not perceptible to the touch
    "an impalpable pulse"

See also: abstract, elusive, imperceptible, subtle, unperceivable

Antonym: palpable

Encyclopedia: Impalpable