"impalpable" in the adjective sense
1. intangible, impalpable
incapable of being perceived by the senses especially the sense of touch
"the intangible constituent of energy"- James Jeans
2. impalpable
imperceptible to the senses or the mind
"an impalpable cloud"
"impalpable shadows"
"impalpable distinctions"
"as impalpable as a dream"
3. impalpable
not perceptible to the touch
"an impalpable pulse"
Source: WordNet® (An amazing lexical database of English)
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