'To doubt not but' definitions:

Definition of 'To doubt not but'

From: GCIDE
  • Doubt \Doubt\, v. t.
  • 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. [1913 Webster]
  • To admire superior sense, and doubt their own! --Pope. [1913 Webster]
  • I doubt not that however changed, you keep So much of what is graceful. --Tennyson. [1913 Webster]
  • To doubt not but.
  • I do not doubt but I have been to blame. --Dryden. [1913 Webster]
  • We doubt not now But every rub is smoothed on our way. --Shak. [1913 Webster]
  • Note: 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. [1913 Webster]
  • 2. To suspect; to fear; to be apprehensive of. [Obs.] [1913 Webster]
  • Edmond [was a] good man and doubted God. --R. of Gloucester. [1913 Webster]
  • I doubt some foul play. --Shak. [1913 Webster]
  • That I of doubted danger had no fear. --Spenser. [1913 Webster]
  • 3. To fill with fear; to affright. [Obs.] [1913 Webster]
  • The virtues of the valiant Caratach More doubt me than all Britain. --Beau. & Fl. [1913 Webster]