- intangible, impalpable - incapable of being perceived by the senses especially the sense of touch; "the intangible constituent of energy"- James Jeans
- impalpable - imperceptible to the senses or the mind; "an impalpable cloud"; "impalpable shadows"; "impalpable distinctions"; "as impalpable as a dream"
Antonyms: palpable, tangible, obvious, perceptible
- impalpable - not perceptible to the touch; "an impalpable pulse"
Antonym: perceptible (indirect, via imperceptible)