5
screwy(adjective, silly, mad, insane, distracted)
5
unbalanced(adjective, silly, crazy, mad, insane)
5
unhinged(adjective, silly, foolish, mad, insane)
4
certifiable
4
cracked(adjective, silly, foolish, crazy, mad)
4
nutty(adjective, silly, foolish, crazy, mad)
4
psychotic(adjective, unstable, disturbed, unhinged)
4
touched(adjective, silly, foolish, crazy, mad)
3
balmy(adjective, silly, foolish, unwise)
3
dotty
3
forgetful(adjective, careless, unconcerned, remote, vague)
3
loco
2
absent(adjective, careless, indifferent, apathetic, unconcerned)
2
absent-minded(adjective, careless, vague, sloppy, out)
2
abstracted(adjective, careless, unconcerned, remote, vague)
2
airheaded(adjective, careless, remote, vague, sloppy)
2
at sixes and sevens(expression, adjective, idiom, distracted, disorganized)
2
bananas
2
bats
2
bats in the belfry(expression, adjective, idiom, wild, silly)
13 years ago|3.4k views|share |citing 
APASmart Define. (2013). out to lunch thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/out_to_lunch/thesaurus/synonyms
ChicagoSmart Define. 2013. "out to lunch thesaurus" https://smartdefine.org/out_to_lunch/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2013, out to lunch thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/out_to_lunch/thesaurus/synonyms>.
MLASmart Define. "out to lunch thesaurus" 17 May 2013. Web. 29 September 2026. <https://smartdefine.org/out_to_lunch/thesaurus/synonyms>