impalpable /im-palˈpə-bl/

1. Not perceivable or detectable by touch
2. Not capable of being comprehended or grasped
3. Extremely fine-grained

impalpabilˈity noun

• hard-favouredness
• hard-featured
• hard-featuredness
• hard feelings
• hard-fern
• hard-ferns
• hard-fisted
• hard-fought
• hard going
• hard-got
• hard-gotten
• hard-grained
• hardgrass
• hardgrasses
• hardhack
• hardhacks
• hard-handed
• hard hat
• hard hats
• hardhead
• hard-headed
• hardheads
• hard-hearted
• hard-heartedly
• hard-heartedness