7
mad(adjective, silly, foolish, crazy, insane)
7
madman(noun, lunatic)
7
maniac(noun, person, crazy, eccentric, cuckoo)
7
screwy(adjective, silly, foolish, crazy, mad)
6
balmy(adjective, silly, foolish, unwise)
6
ding-a-ling(noun, slang, wise, crackpot)
6
fruitcake(noun, nut, fanatic, freak, loony)
6
loon(noun, slang, informal, sick, wise)
6
nuts(noun, adjective, slang, silly, mad)
6
odd(adjective, silly, foolish, usual, unwise)
6
peculiar(adjective, silly, foolish, usual, unwise)
6
psycho(noun, slang, silly, mad, sick)
6
strange(adjective, silly, foolish, usual, unwise)
5
daft(adjective, silly, foolish, crazy, mad)
5
dingbat(noun, person, slang, wise, crackpot)
5
dippy(adjective, silly, foolish, mad, insane)
5
dotty
5
erratic(adjective, silly, foolish, mad, usual)
5
foolish(adjective, silly, unwise)
5
freakish(adjective, usual)
11 years ago|13k views|share |citing 
APASmart Define. (2015). screwball thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/screwball/thesaurus/synonyms
ChicagoSmart Define. 2015. "screwball thesaurus" https://smartdefine.org/screwball/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, screwball thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/screwball/thesaurus/synonyms>.
MLASmart Define. "screwball thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/screwball/thesaurus/synonyms>