non·com·mit·tal /-kəˈmɪtḷ/
(a.)不明朗的,不承擔義務的
Non·com·mit·tal n. A state of not being committed or pledged; forbearance or refusal to commit one's self. Also used adjectively.
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noncommittal
adj : very reluctant to give out information [syn: guarded, unrevealing]