WordWeb Online

1. Persuaded of; very sure
   "were convinced that it would be to their advantage to join"
   - positive, confident
    
2. Having a strong belief or conviction
   "a convinced and fanatical pacifist"

1. Make (someone) agree, understand, or realize the truth or validity of something
   "He had finally convinced several customers of the advantages of his product"
   - convert, win over

See also: certain, convincible, sure

Type of: persuade

Antonym: unconvinced