Source : Webster's Revised Unabridged Dictionary (1913)

Questionless \Ques"tion*less\, a.
   Unquestioning; incurious. [R.]

Questionless \Ques"tion*less\, adv.
   Beyond a question or doubt; doubtless; certainly.[R.]
   --South.

         What it was in the apostles' time, that, questionless,
         it must be still.                        --Milton.