partisan
🇺🇸
/ˈpɑːrtəzn/
🇬🇧
/ˈpɑːtɪzæn/
strongly supporting one side without thinking about others
The news channel is very partisan and only shows one political view.
a strong supporter of a person, group, or idea
She is a partisan of the new policy and defends it strongly.
a fighter in a secret group against enemy forces
The partisan fighters hid in the mountains and attacked the enemy.