non-committal
adj
not showing what one thinks, which side one supports, etc; not committing oneself (思想、 立場等)不表明的, 不表態(tài)的, 不作承諾的
a non-committal attitude, reply, letter 觀點(diǎn)不明確的態(tài)度、 答覆、 信
She was very non-committal about my suggestion. 她對我的建議不置可否. Cf 參看 commit 4.