(a.) Not perceptible to the touch; impalpable; imperceptible; not easily quantified; as, the intangible qualities of a leader\.

aerial aeriform airy asomatous astral atomic bodiless corpuscular decarnate decarnated dim discarnate disembodied eluding elusive embryonic ethereal evanescent evasive extramundane fleeting germinal ghostly granular immaterial impalpable imperceptible imponderable imprecise inappreciable incorporate incorporeal indefinite indiscernible infinitesimal insensible insubstantial invisible microcosmic microscopic molecular nonmaterial nonphysical nonsubstantial obscure occult otherworldly phantom psychic rare shadowy slender slight spiritual subatomic supernatural tenuous thin transmundane ultramicroscopic unapparent unappreciable unconcrete unearthly unembodied unextended unfleshly unobservable unperceivable unphysical unseeable unsolid unsubstanced unsubstantial unworldly vague vaporous weightless