Webster's Revised Unabridged Dictionary · 1913

Doubt

Doubt (dout) , intransitive verb

[Old English duten, douten, Old French duter, doter, douter, French douter, from Latin dubitare; akin to dubius doubtful. See Dubious.]

1.
To waver in opinion or judgment; to be in uncertainty as to belief respecting anything; to hesitate in belief; to be undecided as to the truth of the negative or the affirmative proposition; to b e undetermined.
Even in matters divine, concerning some things, we may lawfully doubt, and suspend our judgment. — Hooker
To try your love and make you doubt of mine. — Dryden
2.
To suspect; to fear; to be apprehensive. [Obsolete]

Doubt , transitive verb

1.
To question or hold questionable; to withhold assent to; to hesitate to believe, or to be inclined not to believe; to withhold confidence from; to distrust; as, I have heard the story, but I doubt the truth of it.
To admire superior sense, and doubt their own! — Pope
I doubt not that however changed, you keep So much of what is graceful. — Tennyson
I do not doubt but I have been to blame. — Dryden
We doubt not now But every rub is smoothed on our way. — Shakespeare

That is, we have no doubt to prevent us from believing, etc. (or notwithstanding all that may be said to the contrary) -- but having a preventive sense, after verbs of “doubting” and “denying” that convey a notion of hindrance. E. A. Abbott.

2.
To suspect; to fear; to be apprehensive of. [Obsolete]
Edmond [was a] good man and doubted God. — R. of Gloucester
I doubt some foul play. — Shakespeare
That I of doubted danger had no fear. — Spenser
3.
To fill with fear; to affright. [Obsolete]
The virtues of the valiant Caratach More doubt me than all Britain. — Beau. & Fl

Doubt , noun

[Old English dute, doute, French doute, from douter to doubt. See Doubt, v. i.]

1.
A fluctuation of mind arising from defect of knowledge or evidence; uncertainty of judgment or mind; unsettled state of opinion concerning the reality of an event, or the truth of an assertion, etc.; hesitation.
Doubt is the beginning and the end of our efforts to know. — Sir W. Hamilton
Doubt, in order to be operative in requiring an acquittal, is not the want of perfect certainty (which can never exist in any question of fact) but a defect of proof preventing a reasonable assurance of quilt. — Wharton
2.
Uncertainty of condition.
Thy life shall hang in doubt before thee. — Deut. xxviii. 66
3.
Suspicion; fear; apprehension; dread. [Obsolete]
I stand in doubt of you. — Gal. iv. 20
Nor slack her threatful hand for danger's doubt. — Spenser
4.
Difficulty expressed or urged for solution; point unsettled; objection.
To every doubt your answer is the same. — Blackmore
Collocations (2)
No doubt , undoubtedly; without doubt.
Out of doubt , beyond doubt. [Obsolete] — Spenser