in·tel·li·gence  [in-tel-i-juhns]  –noun
1. capacity for learning, reasoning, understanding, and similar forms of mental activity; aptitude in grasping truths, relationships, facts, meanings, etc.
discernment, reason, acumen, aptitude, penetration.
stupidity. Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

The antonym can also be found here.

To Monica:  Fuck you and the horse you rode in on, you ignorant, self-centered moron.  [Edited to strike that out – I realize it could be seen as a personal attack.  And I sincerely do not want to perpetuate what Monica started.]

Signed:  One of Sybil’s henchwomen