2
feather-brained
2
guileless(adjective, simple, honest, straightforward, innocent)
2
gullible(adjective, simple, silly, stupid, fresh)
2
halfwitted
2
hare-brained
2
inane(adjective, silly, foolish, stupid, green)
2
ingenuous(adjective, simple, straightforward, fresh, innocent)
2
innocent(adjective, simple, plain, straightforward, sincere)
2
innocuous(simple, fresh, innocent, ignorant, harmless)
2
late(adjective, backward)
2
lumpish
2
mad
2
mindless(adjective, silly, stupid, green, fat)
2
scatterbrained(adjective, simple, slow, foolish, stupid)
2
shallow(adjective, simple, slow, silly, stupid)
2
simplistic
2
thickheaded
2
unsophisticated(adjective, simple, straightforward, innocent, naive)
1
aboveboard(simple, plain, straightforward, fresh, innocent)
1
addled(adjective, simple, slow, stupid, boring)
12 years ago|3.8k views|share |citing 
APASmart Define. (2013). simple-minded thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/simple-minded/thesaurus/synonyms
ChicagoSmart Define. 2013. "simple-minded thesaurus" https://smartdefine.org/simple-minded/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2013, simple-minded thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/simple-minded/thesaurus/synonyms>.
MLASmart Define. "simple-minded thesaurus" 17 October 2013. Web. 21 September 2026. <https://smartdefine.org/simple-minded/thesaurus/synonyms>