thickheaded

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Definitions from WordNet

Adjective thickheaded has 1 sense

blockheaded, boneheaded, fatheaded, loggerheaded, thick, thickheaded, thick-skulled, wooden-headed - used informally
Antonym: smart (indirect, via stupid)

Definitions from the Web

Thickheaded

Adjective

1. lacking intelligence or common sense; slow-witted.

Example sentence: Tom's thickheadedness was evident when he failed to comprehend the simple instructions.

Adjective

2. stubborn or obstinate, unwilling to change opinions or views.

Example sentence: Despite clear evidence, Mary remained thickheaded and refused to accept the truth.

Adjective

3. having a dense skull or a thick layer of bone, resistant to physical impact.

Example sentence: The thickheaded construction worker wore a protective helmet to minimize any potential head injuries.

Noun

4. (informal) a person who is unintelligent or slow to understand.

Example sentence: Don't bother asking Mike for help; he's a complete thickheaded when it comes to math.