Definition of doubt:

• To waver in opinion; to hesitate; to be in suspense or uncertainty respecting the truth; to be apprehensive or suspect.
• To regard as questionable; to hesitate to believe; to suspect; to distrust.
• To hesitate; to waver in opinion; to suspect; to fear; to hesitate to believe; to be in a state of uncertainty of mind.
• Uncertainty or hesitation of mind respecting truth or propriety, arising from defect of knowledge or evidence; suspense; matter of doubt; suspicion; fear.
• Uncertainty of mind; suspense; suspicion; fear; apprehension.

Usage examples for doubt

1. She replied, " I will not doubt any more."  A Woman's Life-Work Labors and Experiences by Laura S. Haviland

2. It was his eyes he was in doubt about.  Eunice by Margaret Murray Robertson

3. Little doubt about that.  The Three Lieutenants by W.H.G. Kingston

4. " I have no doubt of it," replied the captain.  The Boy Volunteers with the Submarine Fleet by Kenneth Ward