1. likely to cause disagreement or argument; controversial
2. argumentative; inclined to argue or quarrel

Examples

• The proposal to build a new highway through the park was highly contentious.
• Climate change remains a contentious issue in political debates.
• He became contentious whenever anyone disagreed with his opinions.
• The contentious divorce proceedings lasted for months.
• She avoided discussing contentious topics at family gatherings.
• The board meeting grew heated over the contentious budget cuts.
• His contentious nature made it difficult to work with him.