noncommittal

adjective

refusing to bind oneself to a particular course of action or view or the like
行動、視点、あるいは好みの方針に自分自身を結び付けることを拒絶するさま
- her boyfriend was noncommittal about their future together
  彼女のボーイフレンドは、彼ら二人の将来について曖昧だった

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