whether one likes it or not; willy-nilly
Set phrase meaning that something will happen regardless of one's feelings or consent. Often used with verbs like ～させる, ～なる, or ～しなければならない.
I have to finish this work by tomorrow whether I like it or not.
彼の話を聞いていると、否が応でもやる気が出てくる。
Listening to him, you feel motivated willy-nilly.