(transitive) To ask questions of; to interrogate; to ask for information. / (transitive) To raise doubts about; have doubts about.

A sentence, phrase or word which asks for information, reply or response; an interrogative. / A subject or topic for consideration or investigation.

To ask that a proposed question's presuppositions be explicitly justified, especially as a preliminary to answering it, for example a complex question or loaded question.

Under consideration, under discussion. / In doubt, under dispute.

The state or condition of being questionable; dubiousness.

Problematic; open to doubt or challenge. / Of dubious respectability or morality. / (obsolete) Inviting questions; inviting inquiry.

in a questionable manner

The state of being questionable.

Without a doubt; certainly.

plural of questioner