- Level - headed
- Sensible
- Sane
- Sensible
- Smooth, titled, yet calmly rational
- Unflappable
- Compos mentis
- Of sound mind
- Rational
- Right-minded
- Sensible
- Showing reason
- Sound in mind
- Having the capacity to reason
- Intelligent
- Logical
- Reasonable
- Sensible
- Relating to the reason; not physical; mental.
- Having reason, or the faculty of reasoning; endowed with
reason or understanding; reasoning.