featureless

featureless
    adj 1: lacking distinguishing characteristics or features; "the
           featureless landscape of the steppe"
    

Featureless \Fea"ture*less\ (?; 135), a.
   Having no distinct or distinctive features.
   [1913 Webster]
    

110 Moby Thesaurus words for "featureless":
      abstract, amorphic, amorphous, anarchic, articulated, baggy, bare,
      barren, bland, blank, bleached, blobby, blurred, blurry, broad,
      catenated, ceaseless, chaotic, characterless, clear, collective,
      concatenated, confused, connected, constant, continual, continued,
      continuing, continuous, cyclical, devoid, direct, disorderly,
      empty, endless, formless, fuzzy, gapless, general, generalized,
      generic, hazy, hollow, immediate, inane, incessant, inchoate,
      indecisive, indefinite, indeterminate, inform, insipid,
      interminable, joined, jointless, kaleidoscopic, linked, lumpen,
      misty, monotonous, nebulous, neutral, never-ending, nondescript,
      nonspecific, nonstop, null, null and void, obscure, orderless,
      perennial, periodic, recurrent, repetitive, round-the-clock,
      running, seamless, serried, shapeless, smooth, stable, steady,
      straight, twenty-four-hour, unbroken, unceasing, uncharacterized,
      unclear, undefined, undifferentiated, unending, uniform,
      unintermitted, unintermittent, unintermitting, uninterrupted,
      unordered, unorganized, unrelieved, unremitting, unspecified,
      unstopped, vacant, vacuous, vague, void, white, wide,
      with nothing inside, without content