It must be unquestioning, undoubting; a conviction that amounted to certainty.
Such was the undoubting conviction of Jefferson to his dying day.
Prosper therefore, with undoubting heart despising the rabble of the wise.
The old sailors found in us attentive and undoubting listeners.
What a solace Christianity must be to one who has an undoubting conviction of its truth.
He sprang to his feet, and caught her in his undoubting arms.
It was thus, with the most generous and undoubting spirit, that I rushed upon irretrievable ruin.
I know how sincere you are, and how—I wish I had your undoubting spirit!
Not only himself, but to find him loving Rose for her father's sake, undoubting of him through all.
This cardinal experience is an undoubting, immediate sense of God.
early 13c., "to dread, fear," from Old French doter "doubt, be doubtful; be afraid," from Latin dubitare "to doubt, question, hesitate, waver in opinion" (related to dubius "uncertain;" see dubious), originally "to have to choose between two things."
The sense of "fear" developed in Old French and was passed on to English. Meaning "to be uncertain" is attested in English from c.1300. The -b- was restored 14c. by scribes in imitation of Latin. Replaced Old English tweogan (noun twynung), from tweon "two," on notion of "of two minds" or the choice of two implied in Latin dubitare (cf. German Zweifel "doubt," from zwei "two").
early 13c., from Old French dote (11c.) "fear, dread; doubt," from doter (see doubt (v.)).