noun, noun or participle which takes 'suru', intransitive verb
half-hearted reply; vague answer; reluctant answer
A reply given without real thought or enthusiasm, often just to get through the conversation. Can be used as a noun or with する to mean giving such a reply.
彼はいつも生返事しかしない。
He never gives anything but half-hearted replies.
大事な話なのに生返事をされて
I got angry because I received a vague answer even though it was an important matter.