Source : Webster's Revised Unabridged Dictionary (1913)

Noncommittal \Non`com*mit"tal\, n.
   A state of not being committed or pledged; forbearance or
   refusal to commit one's self. Also used adjectively.

Source : WordNet®

noncommittal
     adj : very reluctant to give out information [syn: {guarded}, {unrevealing}]