Related Clues:

• Compos mentis
• Together, so to speak
• Uncertifiable?
• Down-to-earth
• On one's rocker?
• Right
• Thoughtful
• Unlikely to cheat
• Having a full set of marbles
• High-minded
• Sound upstairs
• Of sound mind
• Cool and collected
• Commonsensical
• Fit to be tried