* Pugnacious: (adj.) eager or quick to argue or fight.
* Pugnacity: (n.) the quality of being eager or quick to argue or fight.
* Impugn: (v.) to dispute the truth or validity of something.
* Repugnant: (adj.) causing a strong feeling of dislike or disgust.
* Repugnance: (n.) a strong feeling of dislike or disgust.
These words all have a connection to the idea of conflict or opposition.