questionnable

Questionnable is a rarely used or archaic variant spelling of the English adjective questionable. The meaning is the same: describing something that invites doubt, is uncertain, or warrants further examination. In contemporary writing, the standard form is "questionable."

Historical usage and spelling: The form "questionnable" reflects older orthographic conventions in which the suffix -able could appear as -nable in some texts. It appears in some early modern English writings and in certain regional or nonstandard spellings. Over time, "questionable" became the predominant form, and "questionnable" is now typically considered obsolete or nonstandard in most contexts.

Modern status and usage: Most dictionaries and style guides list "questionnable" as archaic or dialectal. In modern prose, writers should use "questionable." The related noun forms are "questionableness" and "questionability." When quoting historical documents or discussing orthography, the variant may appear for illustrative purposes, but it is not standard today.