impalpable

Adjective
  1. Incapable of being perceived by the senses especially the sense of touch (synset 302400435)
    "the intangible constituent of energy"
  2. Imperceptible to the senses or the mind (synset 301721906)
    "an impalpable cloud"; "impalpable shadows"; "impalpable distinctions"; "as impalpable as a dream"
  3. Not perceptible to the touch (synset 301753200)
    "an impalpable pulse"

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