'dubious hypothesis' is a correct and usable phrase in written English.
You can use it to refer to a theory, statement, or idea that seems unlikely to be true or accurate. For example, "The scientist proposed a dubious hypothesis about the connections between the two phenomena."
A common tactic used by those promoting dubious hypotheses is to argue that the claim in question is just another example of something that is already supported by good quality evidence and is accepted by the scientific community.
However, the exact mechanism of Pickett effect is still mysterious although several dubious hypotheses were proposed.
The authors are dubious about the hypothesis proposed by several evolutionists of mixed membranes in LUCA, with both sn2,3 and sn1,2 lipids made by a non enantio-specific enzyme.
Regarding this hypothesis as dubious, the authors embarked upon testing whether different geographic, historical, social and economic settings would produce similar sets of indicators explaining social vulnerability to floods, thus justifying the application of such variables in generalised spatial models.
The notion that fatty foods shorten your life began as a hypothesis based on dubious assumptions and data; when scientists tried to confirm it they failed repeatedly.
Finally, a common objection has it that the universality of doubt undermines the method of doubt itself, since, for example, the sceptical hypotheses themselves are so dubious.
Still, the theory seemed dubious.
Their work has sparked the wide popularity of the bipolar hypothesis, yet it is rife with dubious assumptions.
He pointed out that skepticism implies a doubting; but in his "as if " philosophy there is nothing dubious about patently false fictions that, unlike ordinary hypotheses, are not subject to verification.
