[f. prec. + -NESS.] The state of being questionable; doubtfulness, etc.
1668. H. More, Div. Dial., II. xxii. (1713), 158, marg. From the Questionableness whether there does not as much good redound to the Universe.
1857. De Quincey, Keats, Wks. 1862, V. 270. The questionableness of its particular statements.
1867. C. J. Smith, Syn. & Antonyms, s.v. Apparent, The adverb apparently admits the sense of questionableness still more strongly.