General antonyms:
* Cowardly: This is the most direct and common antonym.
* Fearful: This emphasizes the feeling of fear.
* Timid: This emphasizes shyness and lack of confidence.
* Hesitant: This emphasizes the reluctance to act.
Contextual antonyms:
* Reckless: This could be an antonym if "brave" refers to careful courage.
* Foolish: This could be an antonym if "brave" refers to intelligent courage.
* Dishonest: This could be an antonym if "brave" refers to courageous honesty.
The best antonym for "brave" will depend on the specific situation and meaning you want to convey.