undoubtful

English

Etymology

un- +‎ doubtful

Adjective

undoubtful (comparative more undoubtful, superlative most undoubtful)

1. Not doubtful.
   • 1844, William Clowes, The Journals of William Clowes: A Primitive Methodist Preacher:

     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.