noun
pinhead
PIHN-hehd
noun
1
The small, rounded head of a pin, often used to describe something tiny.
"The rash left marks no bigger than a pinhead."
2
An insulting term for a foolish or stupid person.
"Stop acting like a pinhead and read the instructions."
How to Use Pinhead
Learner’s notesIn plain EnglishEither the tiny round tip of a pin, or, as an insult, someone acting foolishly.
When to use it
The "stupid person" sense is informal and mildly rude — best used casually, not in professional writing.
Word Forms
pinheads plural, Pinheads plural
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Etymology
From pin + head, originally describing the literal small round tip of a pin.