Thickheaded

adj, slang

adj, slang ·Common ·High school level

Definitions

Adjective

1
stupid, obtuse or dumb. informal

Adjective

1
(used informally) stupid wordnet

Synonyms

harebrained addlebrained addlepated airheaded ass-brained baby-brained

Antonyms

brainy bright quick on the uptake quickwitted

Example

"I know that Tom is thickheaded."

Etymology

From thick + headed.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.