The definition of an antagonist is a person or thing that competes with or goes against another.
The definition of an opponent is someone who you compete against, who has interests opposing yours, or is a person who is against something.
(Logic) The relation of exclusion or inclusion which exists between propositions having the same subject and predicate but differing in quality, quantity, or both
A person who fights against a government.
A substance that resists, esp. something applied as a protective coating
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Find another word for oppositionist. In this page you can discover 8 synonyms, antonyms, idiomatic expressions, and related words for oppositionist, like: adversary, antagonist, opponent, opposer, opposition, resister, resist and support.