pinhead

IPA: pˈɪnhɛd

The head of a pin. (Frequently used in size comparisons.)
(slang) A 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.
(mycology) The immature juvenile fruiting body of a mushroom prior to its gills opening.
(slang, derogatory) A member of the Provisional IRA.

Examples of "pinhead" in Sentences

He was such a pinhead that he couldn't even tie his own shoelaces
The pinhead insisted on arguing over the smallest details, making the meeting drag on forever
My little brother is a pinhead for forgetting his homework again
I can't believe that pinhead cut me off on the highway without signaling
The pinhead at the office always takes credit for other people's ideas