dissenter

US /dɪˈsen.t̬ɚ/
UK /dɪˈsen.t̬ɚ/
"dissenter" picture
1.

a person who dissents, as from an established church, political party, or majority opinion.

:
The lone dissenter in the group voiced his objections to the proposal.
Historically, dissenters often faced persecution for their beliefs.