WordReference Random House Unabridged Dictionary of American English © 2026
thick•head•ed
(thik′hed′id),USA pronunciation adj.
thick′head′ed•ly, adv.
thick′head′ed•ness, n.
- (of a person) dull-witted;
stupid. - Zoology(of an animal) having a thick head.
- thick + headed 1700–10
thick′head′ed•ness, n.
'thickheaded' also found in these entries (note: many are not synonyms or translations):