dumbhead

As a noun dumbhead

is (informal|derogatory) a stupid person.

As a verb girlcott is

(informal|of women) to boycott.

As nouns the difference between dumbhead and idiot

is that dumbhead is (informal|derogatory) a stupid person while idiot is (slang|derogatory) a proponent of intelligent design.

As nouns the difference between terms and dumbhead

is that terms is while dumbhead is (informal|derogatory) a stupid person.

As nouns the difference between dumbhead and dumbass

is that dumbhead is (informal|derogatory) a stupid person while dumbass is (us|vulgar|slang) a stupid or foolish person.

As an adjective dumbass is

stupid, foolish.

As nouns the difference between stupid and dumbhead

is that stupid is a stupid person; a fool while dumbhead is (informal|derogatory) a stupid person.

As an adjective stupid

is lacking in intelligence or exhibiting the quality of having been done by someone lacking in intelligence.

As an adverb stupid

is (slang|dated) extremely.