The phrase "questionable morality" is correct and can be used in written English.
It is typically used to describe actions, behaviors, or decisions that are morally questionable or controversial. Example: The company's decision to cut corners in their manufacturing process raises serious questions about their ethical standards and questionable morality.
Why do we tolerate the questionable morality and behavior that too many on Wall Street get rewarded to exhibit?
But the real undercurrent of the drama is the tyranny of appearances and the questionable morality of making a living by taking advantage of people's anxieties.
Torn by "the questionable morality of war," he turned for advice to Father Clark Kennedy, a priest in New Haven, who, as a chaplain in the First World War, had witnessed horrible scenes of battle.
To retroactively reduce the compensation an employee received for work performed decades ago is quite another matter, one of questionable morality and law.
COLLEGE students who share their music files on the Internet have been accused of stealing copyrighted works, or at least of exhibiting questionable morality.
In April, the Formula One series received near universal criticism for holding its race in a country experiencing a social uprising that brought daily demonstrations against the government, where the safety and the smooth running of the race were in doubt — to say nothing of the questionable morality of running the race in place accused of oppressing its citizens.
Underscoring his reputation as an elite conservative of questionable assets and flexible morality, the sport's high price tag makes Romney an easy target during this campaign season.
Undone might be a questionable dissection of contemporary sexual morality and moralizing, but far better that we have these provocative not-quite-Lolitas than a sea of bland more-of-the-same.
Questionable decisionmaking and moral ambiguity reigned supreme.
But, morally, it was questionable.
After 1945, a new morality of music evolved, based on two questionable but potent syllogisms: (1) if Hitler liked it, it must be bad; (2) if Hitler hated it, it must be good.
