· someone who offers opposition
Synonym(s): adversary, opponent, opposer, resister
Hypernym(s): person, individual, someone, somebody, mortal, soul
Antonym(s): agonist
· a muscle that relaxes while another contracts; "when bending the elbow the triceps are the antagonist"
Hypernym(s): antagonistic_muscle
· a drug that neutralizes or counteracts the effects of another drug
Hypernym(s): drug
Antonym(s): synergist