"shaky assumption" is a correct and usable expression in written English.
You can use it to refer to an assumption that is uncertain or unreliable. For example, "It's a shaky assumption that the project will finish on time given the lack of resources."
This is all on the shaky assumption that Labour ends up with 261 seats and the Liberal Democrats hold 54.
A rebound is a dangerously shaky assumption if you look beyond those green shoots and see that our nation may be in the throes of a rolling bankruptcy with no one left to bail us out.
And that is a mighty shaky assumption.
I don't think I'm smart, and sometimes I feel that my academic "successes" (I use that term very, very lightly and under the shaky assumption that high school students can even have academic successes) have simply been a combination of elbow grease and luck.
Even with the shaky assumption that the R01 will hold its ground at 69% of RPGs (FY2009, down from ~75+% in the glory days of the NIH), this budget would drop the R01 below 37% of the overall NIH budget (down from ~43% in the FY1988 2002 period).
On closer examination, some shaky assumptions underlie these hard-nosed generalizations.
But, on a third viewing, Shawn's play, for all its darkly mesmerising power, depends on a number of shaky assumptions.
"If we had a Republican president ready to sign bills into law, what would we do?" This instrumental view of the Presidency — that a Republican in the White House would serve more or less as an Autopen for Ryan's ideas — rested, even apart from Trump, on two shaky assumptions.
But that plan also rests on some shaky assumptions.
Or is it slight, a novelty or built on shaky assumptions of use patterns?
But such explanations are almost always based on shaky assumptions.
