an adherent or supporter of a person, group, party, or cause, esp. a person who shows a biased, emotional allegiance.

Military . a member of a party of light or irregular troops engaged in harassing an enemy, esp. a member of a guerrilla band engaged in fighting or sabotage against an occupying army.

of, pertaining to, or characteristic of partisans; partial to a specific party, person, etc.

partisan politics.

of, pertaining to, or carried on by military partisans or guerrillas.

adjective

disinterested

adjective

accessory , adhering , biased , bigoted , blind , cliquish , colored , conspiratorial , denominational , devoted , diehard * , exclusive , fanatic , jaundiced , one-sided , overzealous , partial , prejudiced , prepossessed , sectarian , sympathetic , tendentious , unjust , unreasoning , warped , zealous , prejudicial , dogmatic , factionary

noun

accessory , adherent , backer , champion , cohort , defender , devotee , disciple , follower , satellite , stalwart , supporter , sycophant , sympathizer , upholder , votary , zealot , henchman , minion , advocate , aficionado , ally , doctrinal , fanatic , guerilla , sectarian