non-committal
adjective /ˌnɒn kəˈmɪtl/
  /ˌnɑːn kəˈmɪtl/
 - not giving an opinion; not showing which side of an argument you agree with- a non-committal reply/tone
- The doctor was non-committal about when I could drive again.
 Oxford Collocations DictionaryNon-committal is used with these nouns:- grunt
- reply