undoubtful
adjEtymology From un- + doubtful.
1
Not doubtful.
- I was utterly unconscious of this irregularity, and might have remained so, had not a friend the next day asked me the reason of it. Indeed I should have disbelieved that it had taken place, had not the testimony of several persons rendered it undoubtful.1844, William Clowes, The Journals of William Clowes: A Primitive Methodist Preacher:
- Derived terms
- undoubtfully, undoubtfulness