questionable
adjective
uk/ˈkwestʃənəbl/ usuncertain or not likely to happen:
The company's future looked questionable.
It is questionable whether they will get sales moving sufficiently fast to satisfy growth-hungry investors.
something that is questionable may not be true or accurate, or could be doubted:
We are concerned the Bank is being asked to make rate decisions on questionable data.
questionable evidence
Some countries have banned advertising of nutritionally questionable food to children.
probably not good or honest:
He was accused of questionable accounting practices.
Selling loans to people with questionable credit was a popular trend over the past few years.