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doubt
n
doubtful
adj
doubtful
adj
redoubt
n
redoubt
n
Example
She couldn't shake the nagging doubt that she had made the wrong decision.
His confidence wavered in the face of uncertainty, giving rise to doubt.
Despite his assurances, doubt lingered in the back of her thoughts.
The lack of evidence cast doubt on the accuracy of the report.
The lack of evidence cast doubt on the reason for his sudden disappearance.