* Uncooperative: This is the most direct opposite, meaning unwilling to work with others.
* Competitive: This emphasizes striving to be better than others, rather than working together.
* Antagonistic: This suggests a hostile or adversarial relationship.
* Obstructive: This implies actively hindering progress or cooperation.
* Individualistic: This focuses on prioritizing personal goals over group goals.
* Selfish: This suggests a lack of concern for the needs of others.
The best opposite word to use will depend on the specific situation and the nuance you want to convey.