Positive:
* Genius: Implies exceptional intellectual ability.
* Wise: Suggests sound judgment and understanding.
* Intelligent: Means having or showing intelligence.
* Brilliant: Describes someone with outstanding intellect.
* Savant: A person with a specific exceptional mental ability.
Neutral:
* Smart: Indicates practical knowledge and quick thinking.
* Clever: Suggests ingenuity and resourcefulness.
* Astute: Implies keen perception and judgment.
* Sharp: Means quick-witted and perceptive.
Other:
* Sane: Implies a normal state of mind, opposite of being foolish or irrational.
* Rational: Indicates logical and reasonable thinking.
The best word to use will depend on the specific situation and the tone you want to convey.