Impalpable

Part of speech: adjective (a.)

1. Not palpable; that cannot be felt; extremely fine, so that no grit can be perceived by touch. "Impalpable powder." Boyle.

2. Not material; intangible; incorporeal. "Impalpable, void, and bodiless." Holland.

3. Not apprehensible, or readily apprehensible, by the mind; unreal; as, impalpable distinctions.