untalkative

from WordNet (r) 3.0 (2006)

untalkative
    adj 1: temperamentally disinclined to talk [syn: {reticent},
           {untalkative}]

from Moby Thesaurus II by Grady Ward, 1.0

26 Moby Thesaurus words for "untalkative":
      brief, brusque, close, close-tongued, closemouthed, concise, curt,
      dumb, economical of words, indisposed to talk, laconic, mum, mute,
      quiet, short, silent, snug, sparing of words, speechless, taciturn,
      terse, tight-lipped, tongue-tied, unloquacious, word-bound,
      wordless