5
crazy(adjective, knowledge, ability, informal)
4
half-baked
4
screwball
3
absurd(adjective, knowledge, ability)
3
chuckleheaded
3
disturbed
3
foolish(adjective, knowledge, ability)
3
insane(adjective, knowledge, ability)
3
lunatic(adjective, knowledge, ability)
3
mad(adjective, knowledge, ability)
3
preposterous(adjective, knowledge, ability)
3
tomfool(adjective, knowledge, ability, foolish)
2
balmy(adjective, knowledge, slang, ability)
2
cockeyed(adjective, knowledge, ability, informal)
2
demented
2
dippy(adjective, knowledge, slang, ability)
2
distracted
2
doltish
2
dopey(adjective, knowledge, slang, ability)
2
gaga
12 years ago|7.5k views|share |citing 
APASmart Define. (2013). softheaded thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/softheaded/thesaurus/synonyms
ChicagoSmart Define. 2013. "softheaded thesaurus" https://smartdefine.org/softheaded/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2013, softheaded thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/softheaded/thesaurus/synonyms>.
MLASmart Define. "softheaded thesaurus" 17 October 2013. Web. 22 September 2026. <https://smartdefine.org/softheaded/thesaurus/synonyms>