WordWeb Online

1. Marked by or given to doubt
   - questioning, skeptical [N. Amer], sceptical [Brit, Cdn]

1. Consider unlikely or have doubts about
   "I doubt that she will accept his proposal of marriage"
    
2. Lack confidence in or have doubts about
   "I doubt these reports"

See also: distrustful, doubter

Type of: disbelieve, discredit, distrust, mistrust, suspect

Encyclopedia: Doubt