a person who opposes or disagrees, especially in a group

असहमत व्यक्ति

English Usage: The dissentient voices in the committee were crucial in shaping the final decision.

Hindi Usage: समिति में असहमत व्यक्तियों की आवाजें अंतिम निर्णय को आकार देने में महत्वपूर्ण थीं.