Oxford Dictionary
non-committal
non-commit ¦tal ▶adjective not expressing or revealing commitment to a definite opinion or course of action: her tone was non-committal, and her face gave nothing away. DERIVATIVES non-committally adverb
Oxford Thesaurus
non-committal
non-committal adjective she remained silent, apart from a few non-committal remarks: evasive, equivocal, temporizing, guarded, circumspect, reserved; cautious, wary, careful, prudent; discreet, unrevealing, uncommunicative, politic, tactful, diplomatic, vague; informal cagey. ANTONYMS revealing, careless, indiscreet. PHRASES be non-committal Alf was non-committal about their chances of success: prevaricate, give nothing away, play one's cards close to one's chest, straddle an issue, dodge the question /issue, sidestep the issue, hedge, fence, pussyfoot, beat about the bush, equivocate, temporize, shilly-shally, vacillate, waver; Brit. hum and haw; informal duck the question, sit on the fence.