The Collaborative International Dictionary
Doubtable
Doubtable \Doubt"a*ble\, a. [OF. doutable, L. dubitabilis, from dubitare. Cf. Dubitable.]
Capable of being doubted; questionable.
Worthy of being feared; redoubtable. [Obs.]
Wiktionary
doubtable
a. 1 (context uncommon English) Capable of being doubted; doubtful; dubious; dubitable. ''See usage notes below.'' 2 (context obsolete English) fearsome; redoubtable.
Usage examples of "doubtable".
He is become the central subjunctive fact of a Faith, that risks ev'ry-thing upon one bodily Resurrection Wouldn't something less doubtable have done?