I0053100 (ĭm-păl′pə-bəl)adj.1. Not perceptible to the touch; intangible.2. Difficult to perceive or grasp by the mind.im·pal′pa·bil′i·ty n.im·pal′pa·bly adv.Thesaurus
Adv.
1.
impalpably - not substantially; lacking substantial expression or fullnessinsubstantially