The Collaborative International Dictionary of English v.0.48:

nondescript \non"de*script\, a. [Pref. non- + L. descriptus
   described.]
   1. Not hitherto described; hence, of no recognizable type or
      class; odd; abnormal; unclassifiable.
      [1913 Webster]

   2. Dull or uninteresting; undistinguished.
      [PJC]

The Collaborative International Dictionary of English v.0.48:

Nondescript \Non"de*script\, n.
   A thing not yet described; that of which no account or
   explanation has been given; something abnormal, or hardly
   classifiable.
   [1913 Webster]

WordNet (r) 3.0 (2006):

nondescript
    adj 1: lacking distinct or individual characteristics; dull and
           uninteresting; "women dressed in nondescript clothes"; "a
           nondescript novel" [syn: characterless, nondescript]
    n 1: a person is not easily classified and not very interesting

Moby Thesaurus II by Grady Ward, 1.0:

63 Moby Thesaurus words for "nondescript":
   Attic, amorphic, amorphous, anarchic, baggy, bland, blobby,
   blurred, blurry, chaotic, characterless, chaste, classic,
   classical, colorless, common, commonplace, confused, disorderly,
   drab, everyday, featureless, formless, fuzzy, garden,
   garden-variety, hazy, homely, homespun, household, inchoate,
   indecisive, indefinite, indescribable, indeterminate, inform,
   insipid, kaleidoscopic, lumpen, matter-of-fact, misty, obscure,
   orderless, ordinary, plain, prosaic, prosy, pure, pure and simple,
   shapeless, simple, unclassifiable, unclassified, unclear,
   undefined, unexceptional, uninteresting, unordered, unorganized,
   unremarkable, vague, workaday, workday