unkempt (adj.)

1570s, from un- (1) "not" + kempt "well-combed, neat," from variant past participle of Middle English kemben "to comb," from Old English cemban "to comb," from Proto-Germanic *kambijan, from *kamb- "comb" (from PIE root *gembh- "tooth, nail." ). Form unkembed is recorded from late 14c. The verb kemb is rare after 1400s, but its negative past participle form endures.