Subject to, or causing doubt.
Experiencing or showing doubt, skeptical.
Undecided or of uncertain outcome.
A doubtful person or thing.
They had their lists of Liberals and of the doubtfuls who still remained doubtful. As the election drew near, the force of the whole organization was turned upon these unrepentant doubtfuls.
From Middle English doutfull, douteful, equivalent to doubt + -ful.
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