committed

adjectives

bound or obligated, as under a pledge to a particular cause, action, or attitude
"committed church members"; "a committed Marxist"
is derived from
antonym
is similar to
deeply devoted to
"bound up in her teaching"; "is wrapped up in his family"
is similar to
bound by or as if by an oath
"according to an early tradition became his sworn brother"; "sworn enemies"
associated in an exclusive sexual relationship