General Antonyms:
* Offensive: This is the most direct opposite.
* Aggressive: Similar to offensive, but implies more forceful action.
* Open: Suggests willingness to engage and be vulnerable.
* Vulnerable: This may seem counterintuitive, but it can be an antonym if "defensive" implies shielding oneself from harm.
* Proactive: Instead of reacting to threats, this suggests taking initiative.
More Specific Antonyms:
* Supportive: If "defensive" implies protecting oneself from criticism, this suggests being helpful and encouraging.
* Collaborative: If "defensive" implies a reluctance to work together, this suggests being open to teamwork.
* Trusting: If "defensive" implies a lack of trust, this suggests being open and believing in others.
The best antonym for "defensive" will depend on the specific situation and what you are trying to express.