12
delayed(verb, late, overdue, belated, postponed)
10
backward(adjective, ability, offensive, impulsive, late)
10
slow(adjective, dull, ability, slow, offensive)
9
feeble-minded(adjective, dull, ability, offensive, stupid)
8
detained(verb, late, delayed, overdue, belated)
7
impeded(verb, belated)
7
simple(adjective, ability, offensive)
5
behindhand(late, delayed, overdue)
5
belated(late, delayed, overdue)
5
half-baked(adjective, stupid, impulsive, impractical, doomed)
5
half-witted(adjective, ability, offensive)
5
hindered(verb, slowed)
5
overdue(late, delayed, belated)
5
tardy(adjective, late, delayed, overdue)
4
dull(adjective, ability, offensive)
4
idiotic(adjective, impulsive, impractical, half-baked, doomed)
4
imbecile
4
imbecilic(adjective, impulsive, impractical, half-baked, doomed)
4
inhibited
4
late(delayed, overdue)
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APASmart Define. (2016). retarded thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/retarded/thesaurus/synonyms
ChicagoSmart Define. 2016. "retarded thesaurus" https://smartdefine.org/retarded/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, retarded thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/retarded/thesaurus/synonyms>.
MLASmart Define. "retarded thesaurus" 27 January 2016. Web. 22 September 2026. <https://smartdefine.org/retarded/thesaurus/synonyms>