1 obsolete : inviting inquiry. 2 obsolete : liable to judicial inquiry or action. 3 : affording reason for being doubted, questioned, or challenged : not certain or exact : problematic milk of questionable purity a questionable decision.

What type of word is questionable?

Questionable is an adjective - Word Type.

How do you use questionable in a sentence?

1, He behaved in a questionable manner towards her. 2, The statistics are highly questionable . 3, Your argument is based on a set of questionable assumptions. 4, Their motives for undertaking this study are highly questionable.