Synonyms of dopey

1 Syllable
slow, neb, daft, thick, dumb
2 Syllables
dozy, heavy, ditsy, silly, numbskull, dafter, languid, snoozy, puzzled, simple, goofy, foolish, groggy, feeblest, drugged, coked, torpid, dense, mind-blown, mooney, sluggish, stupid, gorked, feebler, dozier, goofier, daftest, clueless, stretchy, unglued, dumdum, strengthless, sleepy, sleepier, nodding
3 Syllables
stupidest, airbrained, lymphatic, hopped-up, junked-up, bollixed, retardo, lethargic, senseless, languorous, slumbery, idiotic, sleepyhead, slumberous, slumberish, retarded, moronic, obtuse, thick-headed, spiritless, somnific, inconscious
4 Syllables
comatose, boneheaded, sleepyheaded, somniferous, somnifacient
5 Syllables
hebetudinous, underachieving