Used in a sentence:
The aura surrounding her was impalable but still strong.
There was an impalpable aura of genius about him. It means unable to be felt.
The captain has been ashore for two hours.
When you catch fish and want to eat them you first have to castrate the fish.
Mutinous men on board killed the captain and appointed one of their own to lead the ship.
After all, they still nee to write commands.