"questionable result" is correct and usable in written English.
You can use it when the result of something is uncertain, uncertain whether it is good or bad, or uncertain whether it will be accepted. Example sentence: He achieved a questionable result on his exam and was unsure whether it would be accepted.
Ministerial hopefuls blame rivals among Mr Sisi's advisers for his questionable result.
If the presidential race is close, this year's "hanging chad" could be a questionable result on electronic voting machines that cannot be adequately investigated.
Later he told the crowd: "Of course I would accept a clear election result, but I would reserve my right to contend or file a legal challenge, in the case of a questionable result".
Several said they were urging their supporters to go to the polls on Monday just to limit the Islamists' gains, even at the risk of appearing to legitimize a questionable result.
In a speech on Thursday, Trump raised new questions about the issue, saying first: "I will totally accept the results of this great and historic presidential election if I win," and then adding: "Of course I would accept a clear election result, but I would reserve my right to contend or file a legal challenge, in the case of a questionable result".
Today's questionable result comes from an English to Italian translation of "call us for free".
Even when AltSchool's methods worked as intended, there were sometimes questionable results.
They also perform "new-age folk" songs together, the questionable results of which are on YouTube.
Despite the questionable results, the women in the study were happy with their treatment, the researchers reported.
Recently, Danny DeVito (One Direction's Everybody Wants to Steal My Girl) and Shia LaBeouf (Sia's Human Heart) have set their acting skills to pop music, with questionable results.
The acting is faultless, but Triomf's tone is oil and water: sadistic black comedy poured on to operatic Oedipal tragedy, with decidedly questionable results.
