The phrase "in a questionable manner" is a correct and usable phrase in written English.
You can use it when you want to describe something that has been done in a way that leaves room for doubt, and therefore raises questions about its quality or effectiveness. For example: "The new employee handled the customer's complaint in a questionable manner, and it resulted in several other customers leaving the store."
It was clear to viewers they were behaving in a morally questionable manner, and the attempt to capture a dog failed".
She further raises issues over the questionable manner in which the police first contacted the local Brazilian media, leading to the story breaking on social media before either herself, her partner's employers or the Argentinian authorities were contacted.
Given the existence of bacteria as biofilms adhered to the mucosal surface throughout the gut, or dispersed within the mucus layer, such an assumption that one fecal specimen would capture all of these ecological niches in an equal manner is questionable to say the least.
Since the definite indications of RBC transfusions in resuscitation of severe sepsis remain questionable, cancer patients with a high prevalence of underlying anemia represent a relevant subgroup to address this question in a prospective manner.
Questionable responses could be verified in a timely manner via human or machine interaction.
What happens when an institution wants to claim religious exemptions for covering treatment for an AIDS patient who contracted the HIV virus in a manner they consider morally questionable?
We have shown, by way of example concerning mtDNA studies on breast cancer, that most case control association mtDNA studies (independent of the impact factor of the journal in which they were published) were undertaken in a very relaxed manner, with questionable scientific standards.
It is a rather questionable relative of the plane, for, though it lifts shavings in a similar manner, it lacks the positive thickness control of the plane.
