Answer:

sane

Answer	Crossword Clue
SANE	Compos mentis
SANE	All there
SANE	Of sound mind

SANE	Rational
SANE	Having one's marbles
SANE	Lucid
SANE	Mentally sound
SANE	Not mad
SANE	With it
SANE	Competent
SANE	Mentally alert

SANE	Reasonable
SANE	Not nuts or crackers?
SANE	Nuts-free?
SANE	Not losing one's mind
SANE	With all marbles present
SANE	Entirely sensible
SANE	Still going upstairs?
SANE	Fit to be tried

SANE	Logical
SANE	Playing with a full deck?
SANE	Fully there?
SANE	Fit to be tried?
SANE	Not cracked
SANE	Well above the neck?
SANE	In your tree?
SANE	Fit to stand trial

SANE	In your right mind
SANE	Right in the head
SANE	In one's right mind
SANE	"Show me a ... man and I will cure him for you": Jung
SANE	Sensible
SANE	Clearheaded
SANE	Coherent
SANE	Levelheaded

SANE	Having a full deck?
SANE	Hardly bananas
SANE	Normal
SANE	Level-headed
SANE	Well-balanced