Adjective in question has 2 senses
- at issue, in dispute, in hand, in question, under consideration - now in consideration or under discussion; "regarding the matter in hand"
Antonym: irrelevant (indirect, via relevant)
- doubtful, dubious, dubitable, in question - open to doubt or suspicion; "the candidate's doubtful past"; "he has a dubious record indeed"; "what one found uncertain the other found dubious or downright false"; "it was more than dubitable whether the friend was as influential as she thought"- Karen Horney
Antonym: unquestionable (indirect, via questionable)
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