also non-committal
You can describe someone as ~ when they deliberately do not express their opinion or intentions clearly.
Mr Hall is non-committal about the number of jobs that the development corporation has created...
Sylvia’s face was ~...
...a very bland non-committal answer.
ADJ: usu v-link ADJ
~ly
‘I like some of his novels better than others,’ I said ~ly.
ADV: ADV after v