obstructive β to block or close up with an obstacle; make difficult to pass: Debris obstructed the road.
oppositional β the action of opposing, resisting, or combating.
opposed β to act against or provide resistance to; combat.
anti β You can refer to people who are opposed to a particular activity or idea as antis.
up against β to, toward, or in a more elevated position: to climb up to the top of a ladder.
against the grain β contrary to one's feelings, nature, wishes, etc.; irritating or displeasing
dissentient β dissenting, especially from the opinion of the majority.
at odds β If someone is at odds with someone else, or if two people are at odds, they are disagreeing or quarrelling with each other.
competing β Competing ideas, requirements, or interests cannot all be right or satisfied at the same time.
rival β a person who is competing for the same object or goal as another, or who tries to equal or outdo another; competitor.
noun enemy
opponent β a person who is on an opposing side in a game, contest, controversy, or the like; adversary.
adversary β Your adversary is someone you are competing with, or arguing or fighting against.
foe β a person who feels enmity, hatred, or malice toward another; enemy: a bitter foe.
competitor β A company's competitors are companies who are trying to sell similar goods or services to the same people.
antagonist β Your antagonist is your opponent or enemy.
nemesis β something that a person cannot conquer, achieve, etc.: The performance test proved to be my nemesis.
agent β A chemical that has a particular effect or is used for a particular purpose can be referred to as a particular kind of agent.
attacker β You can refer to a person who attacks someone as their attacker.
bandit β Robbers are sometimes called bandits, especially if they are found in areas where the law has broken down.
criminal β A criminal is a person who regularly commits crimes.
detractor β The detractors of a person or thing are people who criticize that person or thing.
guerrilla β a member of a band of irregular soldiers that uses guerrilla warfare, harassing the enemy by surprise raids, sabotaging communication and supply lines, etc.
invader β to enter forcefully as an enemy; go into with hostile intent: Germany invaded Poland in 1939.
opposition β the action of opposing, resisting, or combating.
prosecutor β Law. prosecuting attorney. a person, as a complainant or chief witness, instigating prosecution in a criminal proceeding.
rebel β a person who refuses allegiance to, resists, or rises in arms against the government or ruler of his or her country.
spy β a person employed by a government to obtain secret information or intelligence about another, usually hostile, country, especially with reference to military or naval affairs.
terrorist β a person, usually a member of a group, who uses or advocates terrorism.
traitor β a person who betrays another, a cause, or any trust.
villain β a cruelly malicious person who is involved in or devoted to wickedness or crime; scoundrel.
assailant β Someone's assailant is a person who has physically attacked them.
assassin β An assassin is a person who assassinates someone.
backbiter β to attack the character or reputation of (a person who is not present).
betrayer β to deliver or expose to an enemy by treachery or disloyalty: Benedict Arnold betrayed his country.
contender β A contender is someone who takes part in a competition.
revolutionary β of, pertaining to, characterized by, or of the nature of a revolution, or a sudden, complete, or marked change: a revolutionary junta.
saboteur β a person who commits or practices sabotage.
slanderer β defamation; calumny: rumors full of slander.
traducer β to speak maliciously and falsely of; slander; defame: to traduce someone's character.
vilification β to speak ill of; defame; slander.
