PINHEAD
pinhead
(noun) the head of a pin
dumbbell, dummy, dope, boob, booby, pinhead
(noun) an ignorant or foolish person
Source: WordNet® 3.1
Etymology
Noun
pinhead (plural pinheads)
The head of a pin. (Frequently used in size comparisons.)
(slang) An ignorant, naive, foolish, or stupid person.
(slang) A telemark skier.
(slang, medicine) A human head that is unusually tapered or small, often due to microcephaly, or a person with that trait. Often promoted in freak shows as "human pinheads".
(slang, pet stores) A newborn cricket used as food for pets.
(mycoculture) The immature juvenile fruiting body of a mushroom prior to its gills opening.
Synonyms
• (idiot): doofus, dumbbell, dunce
Anagrams
• hand pie, headpin
Source: Wiktionary