English version

non-committal

From Longman Dictionary of Contemporary Englishnon-committalˌnon-comˈmittal adjective  NOT SUREdeliberately not expressing your opinion or intentions clearlynon-committal about The doctor was non-committal about my mother’s chances of recovery. The driver mumbled a non-committal reply.
Examples from the Corpus
non-committalLater he lay in bed beside Anne, trying to think of a satisfactory yet thoroughly non-committal story to tell the police.
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Word of the day atypical not typical or usual