'baldheaded' is formed in English from the adjective 'bald' and the noun 'head' with the adjective-forming suffix '-ed'. 'bald' goes back to Old English 'bald' (and Proto-Germanic *baldaz) and 'head' to Old English 'heafod'.

'bald' appears in Old English; in Middle English the compound form 'bald-headed' (often written with a hyphen) was used to describe someone without hair on the head, and this developed into the modern adjective 'baldheaded'.

Originally roots for 'bald' related to notions of whiteness or patches and later to being bare; over time the sense settled on 'lacking hair', and 'baldheaded' now specifically means 'having little or no hair on the head'.