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-committal• Later he lay in bed beside Anne, trying to think of a satisfactory yet thoroughly non-committal story to tell the police. 