Wit

noun

1. (now usually in the plural) Sanity.

   "He's gone completely out of his wits."

2. (obsolete usually in the plural) The senses.
3. Intellectual ability; faculty of thinking, reasoning.

   "Where she has gone to is beyond the wit of man to say."

4. The ability to think quickly; mental cleverness, especially under short time constraints.

   "My father had a quick wit and a steady hand."

5. Intelligence; common sense.

   "The opportunity was right in front of you, and you didn't even have the wit to take it!"