sworn

Having been asserted as true under oath.

Bound or empowered by an oath.

Avowed.

Past participle of swear; as an adjective, bound by or as by an oath.

p. p. of swear.

originally, companions in arms who took an oath to share together good and bad fortune; hence, faithful friends.

determined or irreconcilable enemies.

close friends.

Given under oath.