1
: the head of a pin
2
: something very small or insignificant
3
: a very dull or stupid person : fool
Synonyms
- airhead
- birdbrain
- blockhead
- bonehead
- bubblehead
- chowderhead
- chucklehead
- clodpoll
- clodpole
- clot [British]
- cluck
- clunk
- cretin
- cuddy [British dialect]
- cuddie
- deadhead
- dim bulb [slang]
- dimwit
- dip
- dodo
- dolt
- donkey
- doofus [slang]
- dope
- dork [slang]
- dullard
- dum-dum
- dumbbell
- dumbhead
- dummkopf
- dummy
- dunce
- dunderhead
- fathead
- gander
- golem
- goof
- goon
- half-wit
- hammerhead
- hardhead
- idiot
- ignoramus
- imbecile
- jackass
- know-nothing
- knucklehead
- lamebrain
- loggerhead [chiefly dialect]
- loon
- lump
- lunkhead
- meathead
- mome [archaic]
- moron
- mug [chiefly British]
- mutt
- natural
- nimrod [slang]
- nincompoop
- ninny
- ninnyhammer
- nit [chiefly British]
- nitwit
- noddy
- noodle
- numskull
- numbskull
- oaf
- prat [British]
- ratbag [chiefly Australian]
- saphead
- schlub [slang]
- shlub
- schnook [slang]
- simpleton
- stock
- stupe
- stupid
- thickhead
- turkey
- woodenhead
- yahoo
- yo-yo
Examples of pinhead in a Sentence
The insect is the size of a pinhead.
Her boss is a real pinhead.
Recent Examples on the Web
Exposure to as little as a pinhead amount of ricin can cause death.
—
Fox News, 7 Nov. 2024
To get some scale for the image, their dazzling red caps are just the size of a pinhead.
—New Atlas, 16 July 2024
Below this sieve is a fine-mesh sieve that captures fossil bits down to 0.02 inch in size (smaller than a pinhead).
—Kristi Curry Rogers, Scientific American, 1 Feb. 2024
The eggs are about the size of a pinhead, according to Candace Fallon, senior conservation biologist at the Xerces Society for Invertebrate Conservation, said.
—Aliza Chasan, CBS News, 7 June 2024
See all Example Sentences for pinhead 
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Fox News, 7 Nov. 2024
To get some scale for the image, their dazzling red caps are just the size of a pinhead.
—New Atlas, 16 July 2024
Below this sieve is a fine-mesh sieve that captures fossil bits down to 0.02 inch in size (smaller than a pinhead).
—Kristi Curry Rogers, Scientific American, 1 Feb. 2024
The eggs are about the size of a pinhead, according to Candace Fallon, senior conservation biologist at the Xerces Society for Invertebrate Conservation, said.
—Aliza Chasan, CBS News, 7 June 2024
See all Example Sentences for pinhead
Dictionary Entries Near pinhead
Cite this Entry
“Pinhead.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pinhead. Accessed 21 Dec. 2024.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share