knucklehead
In real, traceable use. Part of the curated seed collection; community review is coming.
Meaning · English
An idiot; a stupid or inept person.
Register: derogatory, slang
Where it’s used:
Used
American English
Examples
Don't stick that screwdriver into the live electrical outlet, you knucklehead!
Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30)
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Common questions
What does “knucklehead” mean?
An idiot; a stupid or inept person.
Is “knucklehead” formal or informal?
knucklehead is generally derogatory, slang.