Synonyms for retard Found 12 synonyms across 3 meanings for “retard”. a person of subnormal intelligence (noun) idiotimbecilecretinmoronchangelinghalf-wit slow the growth or development of (verb) checkdelay lose velocity (verb) decelerateslow Explore Related Words Rhymes with retardSynonyms for idiotSynonyms for imbecileSynonyms for cretinSynonyms for moronSynonyms for changeling Synonym Finder | Rhyme Finder | Poetry Editor