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1. The state of being unsure of something
   - uncertainty, incertitude, dubiety, doubtfulness, dubiousness
    
2. Uncertainty about the truth, factuality or existence of something
   "the doubt of his claim";
   - dubiousness, doubtfulness, question

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

Derived forms: doubts, doubting, doubted

Type of: cognitive state, disbelieve, discredit, distrust, mistrust, precariousness, state of mind, suspect, uncertainness, uncertainty

Encyclopedia: Doubt, fear, and uncertainty