Argumentative (adjective)

1. Inclined or tending to argue; disposed to disagree or dispute.
2. Given to or characterized by argument; controversial.

Origin:

From the latin word "argumentativus" meaning logical or reasoning.

Examples:

1. He had an argumentative personality and was always ready for a debate.
2. The argumentative tone of the article made it clear that the author was biased.
3. The meeting became argumentative as tempers flared and opinions clashed.
4. The discussion was argumentative and no consensus was reached.
5. The argumentative nature of the text made it difficult to understand the author's point of view.