open question

noun

1. a matter which is undecided
2. a question that cannot be answered with a yes or no but requires a developed answer

Idioms and Phrases

An unresolved issue, one that has not been finally determined. For example, Whether the town should pave all the unpaved roads remains an open question . In the mid-1800s this term acquired a specific meaning in the British Parliament, that is, “an issue on which members may vote independently, without respect to their party affiliation.”

Example Sentences

“It’s still an open question whether they really intend to actually engage with parents the right way,” she said.

From Los Angeles Times

But who exactly will be pardoned - and when - is still an open question.

From BBC

“There’s criticism of electric vehicles, but, then again, his biggest backer runs an electric vehicle company. Tesla gets a lot of business in California, so I think it’s an open question,” Martinez said.

From Los Angeles Times

But it's still an open question.

From BBC

It remains an open question, though, as to why Hamilton - previously known for his adaptability - has not been able to adapt to the driving style required.

From BBC