impalpable

adjectives

incapable of being perceived by the senses especially the sense of touch
"the intangible constituent of energy"- James Jeans
is derived from
imperceptible to the senses or the mind
"an impalpable cloud"; "impalpable shadows"; "impalpable distinctions"; "as impalpable as a dream"
antonym
is similar to
difficult to detect or grasp by the mind or analyze
"his whole attitude had undergone a subtle change"; "a subtle difference"; "that elusive thing the soul"
see also
impossible or difficult to perceive by the mind or senses
"an imperceptible drop in temperature"; "an imperceptible nod"; "color is unperceivable to the touch"
not perceptible to the touch
"an impalpable pulse"
is similar to
impossible or difficult to perceive by the mind or senses
"an imperceptible drop in temperature"; "an imperceptible nod"; "color is unperceivable to the touch"