lost one's marbles
- crazyMentally unhinged
- nutsSeeds in shells
- insaneSeverely mentally disturbed
- bonkersWildly irrational, unhinged
- loonyAbsurdly irrational
crackers · batty · unhinged · deranged · mental · psycho · cuckoo · wacko · demented · cracked · barmy · daft · touched · screwy · nutty · madness · asylum · padded cell
mental state
lost one's marblessane
Mentally healthy, clearheaded
of sound mind · in one's right mind · all there · rational · compos mentis
cognitive sharpness
lost one's marblessharp as a tack
Extremely intelligent and alert
sharp · quick-witted · on the ball · alert · astute