opponent

nouns

a contestant that you are matched against
opponent, opposite, opposition
is derived from
oppose
someone who offers opposition
adversary, antagonist, opponent, opposer, resister
is derived from
oppose

adjectives

characterized by active hostility
"opponent (or opposing) armies"
opponent, opposing
is derived from
oppose
is derived from
oppose
is derived from
oppose
is derived from
oppose
is derived from
oppose