— impalpability , n. — impalpably , adv.
/im pal"peuh beuhl/ , adj.
1. not palpable; incapable of being perceived by the sense of touch; intangible.
2. difficult for the mind to grasp readily or easily: impalpable distinctions.
3. (of powder) so fine that when rubbed between the fingers no grit is felt.
[ 1500-10; IM- 2 + PALPABLE ]