General Opposites:
* Sane: This is the most direct opposite, meaning mentally sound and rational.
* Rational: This emphasizes logical thinking and reasoning.
* Normal: This refers to being within the expected range of behavior and mental state.
* Balanced: This implies emotional stability and a well-functioning mind.
Other Words Depending on the Context:
* Lucid: This implies clarity of thought and understanding.
* Sensible: This suggests practicality and good judgment.
* Reasonable: This emphasizes fair and logical thinking.
* Composed: This implies calmness and self-control.
The best word to use will depend on the specific situation and what aspect of "insane" you want to contrast.