in question

The particular person or thing that people are talking about.

• The person in question is my sister.
• Nobody saw him on the night in question.
• Have you read the document in question?

How to use it: noun + in question (The vehicle in question belongs to my brother.)

Similar words: under discussion, at issue

Common phrases: person in question, day in question, document in question

Uncertain, doubted, or disputed by people.

• His honesty is now in question.
• The future of the school remains in question.
• New evidence has called the result in question.

How to use it: something is in question (The safety of the treatment is in question.); call something in question (The discovery called his account in question.)

Similar words: in doubt, disputed, uncertain

Opposites: certain, undisputed

Common phrases: safety in question, future in question, call in question