Related Clues:

• Not at all out of the question
• Mentally together
• Mentally with it
• Mentally stable
• Sound in one's head
• All there in the head
• Within one's powers
• Not wacko
• "Compos mentis"
• Not loopy
• Not beyond the realm of possibility
• Not at all nutso
• With it, in a sense
• Sound upstairs?
• Balanced in the head