5
non compos mentis
5
nutty
5
psychopathic(adjective, crazy, mad, insane, irrational)
5
screwy
4
balmy
4
certified
4
cracked
4
cuckoo
4
neurotic
4
of unsound mind
4
schizophrenic
4
touched
3
bananas
3
bats
3
bughouse
3
daffy
3
dotty
3
maniacal
3
meshuga
3
out to lunch
10 years ago|6.3k views|share |citing 
APASmart Define. (2016). certifiable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/certifiable/thesaurus/synonyms
ChicagoSmart Define. 2016. "certifiable thesaurus" https://smartdefine.org/certifiable/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, certifiable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/certifiable/thesaurus/synonyms>.
MLASmart Define. "certifiable thesaurus" 29 March 2016. Web. 21 September 2026. <https://smartdefine.org/certifiable/thesaurus/synonyms>