English
knuckleheaded
From knuckle + headed.
A compound of knuckle + headed
Proto-Germanic *knukô ‘bone, joint’
Proto-Germanic *knukilaz ‘knuckle, knot, bump’
Proto-West Germanic *knukil ‘knuckle, joint, small bone’
Old English cnucel ‘the juncture of two bones’
Middle English knokel ‘finger joint’
English knuckle
Today it means
adj Stupid or inept, like a knucklehead.
Language periods are conventional ranges, not dates for this word.
Etymograph / knuckleheaded