| Answer | Crossword Clue |
|---|---|
| impalpable | Unable to be felt by touch |
| unshakable | (of a belief, feeling, or opinion) Strongly felt and unable to be changed |
| impervious | Unable to be affected by |
| unprovable | Unable to be demonstrated by evidence or argument as true or existing |
| inalienable | Unable to be taken away from or given away by the possessor |
| indivisible | (of a number) Unable to be divided by another number exactly without leaving a remainder |
