The Collaborative International Dictionary of English v.0.48:

Kempt \Kempt\ (k[e^]mt; 215),
   1. p. p. of Kemb; combed. --B. Jonson.
      [1913 Webster]

   2. Neatly kept; tidy. Opposite of unkempt.
      [PJC]

The Collaborative International Dictionary of English v.0.48:

Kemb \Kemb\ (k[e^]m), v. t. [imp. & p. p. Kembed (k[e^]md) or
   Kempt (k[e^]mt; 215); p. pr. & vb. n. Kembing.] [OE.
   kemben, AS. cemban, fr. camb comb.]
   To comb. [Obs.]
   [1913 Webster]

         His longe hair was kembed behind his back. --Chaucer.
   [1913 Webster]

WordNet (r) 3.0 (2006):

kempt
    adj 1: (of hair) neat and tidy; "a nicely kempt beard" [syn:
           kempt, tidy]