Source : Webster's Revised Unabridged Dictionary (1913)

Characterless \Char"ac*ter*less\, a.
   Destitute of any distinguishing quality; without character or
   force.

Source : WordNet®

characterless
     adj : lacking distinct or individual characteristics; dull and
           uninteresting; "women dressed in nondescript clothes";
           "a nondescript novel" [syn: {nondescript}]