Adversary

An opponet; enemy

Aggression

a. The act of beginning an ivasion; a bold, uprovoked attack.

b. Hostile action or behavior.

Contradict

a. To express the opposite of. 

b. To deny the statement of. 

c. To be inconsistent with; be contrary to.

Controversy

a. A public dispute between sides holding opposing views.

b. Argument or debate.

Discord

a. A lack of agreement between or among person or groups.

b. a combination of harsh or unpleasant sounds or musical tones; dissonance. 

Embroil

a. To involve in an argument or conflict. 

b. to throw into confusion or disorder; entangle.

Haggle

a. To bargain, as over the price of something.

b. To argue in an attempt to come to terms.

Skirmish

a. A minor battle between small groups of troops, aften as part of a larger battle.

b. a minor or preliminary conflict or disagreement.

Stalemate

a. A situation in which action or progress has come to a halt; a deadlock.

b. A situation in chess in which neither player can win.

Strife

a. Bitter conflict; heated and often violent disagreement.

b. A struggle between rivals.