- informal a stupid or silly person
WordReference Random House Learner's Dictionary of American English © 2026
dim•wit /ˈdɪmˌwɪt/USA pronunciation
n. [countable][Slang.]
WordReference Random House Unabridged Dictionary of American English © 2026- Slang Termsa stupid person.
dim•wit
(dim′wit′),USA pronunciation n. [Slang.]
dim′wit′ted, adj.
dim′wit′ted•ly, adv.
dim′wit′ted•ness, n.
- Slang Termsa stupid or slow-thinking person.
- dim + wit1 1920–25, American.
dim′wit′ted•ly, adv.
dim′wit′ted•ness, n.
- dummy, nitwit, numskull, booby, dumbbell.
Collins Concise English Dictionary © HarperCollins Publishers::
dimwit /ˈdɪmˌwɪt/ n
'dimwit' also found in these entries (note: many are not synonyms or translations):