transitive. To be uncertain or divided in opinion about; to hesitate to believe or trust; to feel doubt about; to call in question; to mistrust.

transitive. To make a question of; to raise the question whether, if, etc.; to doubt, hold as uncertain.

transitive. To have doubts as to the existence, truth, or reality of (a thing); = doubt, v. 2a. Also intransitive.

transitive. To scruple at.

To doubt, question, hesitate to believe (a fact, allegation, etc.); to question the truth, goodness, or genuineness of. Obsolete.

transitive. To hesitate about. Obsolete. rare.

Const. clause: to doubt whether…rare.

transitive. To question, doubt (if, whether, etc.)