Definition of "questionable" []

Open to doubt or challenge; problematic. (adjective)
Not yet determined or specified. (adjective)
Of dubious morality or respectability: a questionable reputation. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Use "questionable" in a sentence

"I. iv.43 (180,4) questionable shape] [By _questionable_ is meant provoking question."
"The problem was, he seemed smart enough to avoid that and to always make her word questionable in front of a third party."
"They decide to try to change the story from the economic meltdown by attacking Obama for what they call questionable past associations when McCain has the Keating 5 in his past."

Words like "questionable"

alleged apocryphal debatable doubtful

dubitable funny impugnable problematic

problematical self-styled shady so-called

soi-disant supposed suspicious unquestionable