BRAINIAC Antonyms There are 4 antonyms of the word brainiac. (opposite meanings)Did you mean?Definition of BRAINIACBest Opposite Words For BRAINIACTop 20Top 10 Top 20 (Default)Top 50 Top 100 All All (Default)WordsPhrases All All (Default)Verb Noun Adjective Adverb RankWordSave?Synonyms..UsageType1idiotnoun, adjectiven, adj2ignoramusnounn3dufusnounn4dumbonounn Alternatives for IDIOT Words (3)changelinghalf-witimbecileOpposite words for idiot Alternatives for DUFUS Words (20)blockheaddoltairheadboneheadclotdumbbellduncefoolgoofballidiotimbecileknuckleheadnincompoopnitwitnumskullthickheadtwitnumbskulllowbrowoafOpposite words for dufus