An antagonist is someone who opposes someone else. In the book "How the Grinch Stole Christmas," the antagonist is the Grinch, because he tries to make life miserable for every Who down in Whoville.

The noun antagonist shows up a lot when people are talking about books, plays, or movies to mean "the bad guy," but it can also be used to talk about a real person if she acts against someone else. An antagonist is always in opposition, but she isn't always bad or mean; your opponent on the tennis court, for example, could be called your antagonist, simply because it is her priority to beat you in your tennis game.

Definitions of antagonist

n someone who offers opposition

adversary, opponent, opposer, resister
someone involved in a contest or battle (as in an agon)
(Christianity) the adversary of Christ (or Christianity) mentioned in the New Testament; the Antichrist will rule the world until overthrown by the Second Coming of Christ
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dueler, duelist, dueller, duellist
a person who fights duels
enemy, foe, foeman, opposition
an armed adversary (especially a member of an opposing military force)
any opponent of technological progress
an opponent who resists with force or resolution
an enemy who lays siege to your position
Type of:
individual, mortal, person, somebody, someone, soul
a human being

n a muscle that relaxes while another contracts

“when bending the elbow the triceps are the antagonist
Type of:
antagonistic muscle
(physiology) a muscle that opposes the action of another

n a drug that neutralizes or counteracts the effects of another drug

a drug that augments the activity of another drug
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estrogen antagonist, tamoxifen
an antagonist for estrogen that is used in the treatment of breast cancer
narcotic antagonist
an antagonist used to counteract the effects of narcotics (especially to counteract the depression of respiration)
Nalline, nalorphine
a narcotic antagonist (trade name Nalline) that counteracts the effects of narcotics (especially the effects of poisoning by morphine)
Narcan, naloxone
a potent narcotic antagonist (trade name Narcan) especially effective with morphine
an oral antagonist against the action of opiates
Type of:
a substance that is used as a medicine or narcotic

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