im·pal·pa·ble /(ˌ)ɪmˈpælpəbəl/
 (a.)不可觸知的,不能感知的,難解的


 Im·pal·pa·ble a.
 1. Not palpable; that cannot be felt; extremely fine, so that no grit can be perceived by touch. “Impalpable powder.”
 2. Not material; intangible; incorporeal. “Impalpable, void, and bodiless.”
 3. Not apprehensible, or readily apprehensible, by the mind; unreal; as, impalpable distinctions.

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 impalpable
      adj 1: incapable of being perceived by the senses especially the
             sense of touch; "the intangible constituent of
             energy"- James Jeans [syn: intangible] [ant: tangible]
      2: imperceptible to the senses or the mind; "an impalpable
         cloud"; "impalpable shadows"; "impalpable distinctions";
         "as impalpable as a dream" [ant: palpable]
      3: not perceptible to the touch; "an impalpable pulse"