Source : Webster's Revised Unabridged Dictionary (1913)

Unkempt \Un*kempt"\ (?; 215), a. [Pref. un- not + kempt, p. p.
   of kemb.]
   1. Not combed; disheveled; as, an urchin with unkempt hair.

   2. Fig.; Not smoothed; unpolished; rough.

            My rhymes be rugged and unkempt.      --Spenser.

Source : WordNet®

unkempt
     adj 1: not neatly combed; "wild unkempt hair"
     2: not neat or cared for; slovenly; "his unkempt appearance"
     3: not properly maintained; "an unkempt garden"; "native vistas
        and unkempt rambling paths"