"dissident" in the noun sense
1. dissenter, dissident, protester, objector, contestant
a person who dissents from some established policy
"dissident" in the adjective sense
1. dissident, heretical, heterodox
characterized by departure from accepted beliefs or standards
2. dissentient, dissenting, dissident
disagreeing, especially with a majority
Source: WordNet® (An amazing lexical database of English)
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