"accustomed, usual," c. 1400, adjectival formation from wont. An unconscious double past participle.
Entries linking to wonted
wont adj.
"accustomed," Middle English contraction of Old English wunod, past participle of wunian "to dwell, inhabit, exist; be accustomed, be used to," from Proto-Germanic *wunen "to be content, to rejoice" (source also of Old Saxon wunon, Old Frisian wonia "to dwell, remain, be used to," Old High German wonen, German wohnen "to dwell;" related to win (v.) and wean), from PIE root *wen- (1) "to desire, strive for." The original meaning of the Germanic verbs was "be content, rejoice."
unwonted adj.
"not usual," 1550s, from un- (1) "not" + wonted. Earlier (and more correctly) unwont (c. 1400).