资料来源 : pyDict

不明朗的,不承担义务的

资料来源 : 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.

资料来源 : WordNet®

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