"murky notions" is a correct and usable phrase in written English
You can use it to describe ideas or concepts that are difficult to comprehend or understand. For example, "The professor's explanation of quantum physics left us with murky notions."
The murkiest notion appeared to be the representation of the medical error itself.
Of course, if we go beyond this to more complex (and admittedly more interesting) statements, for example, to hypotheses of ancestry and descent, the picture becomes murkier because such notions cannot be tested; we are back to probability judgements, and unquantifiable ones at that, although now we can see where they are coming from.
These companies, which include communications media like Facebook and Twitter, write their own edicts about what kind of expression is allowed, things as diverse as pointed political criticism, nudity and notions as murky as hate speech.
We'd entered a murky area of conflicting notions of honor, pride, ambition and self-respect, and though to the observer his transgression might have been justifiable, you could also understand their disapproval.
Like the Soviet show trials of old, the May 6th prosecution serves as a kind of theatrical ritual in which demonstrating the wickedness of the crime is just as important as proving guilt.Beyond that, the case gives the state a chance to relate the anti-Putin protesters to the perennial notion of murky enemies abroad who wish Russia harm.
The reader gets little flavour of Chechnya's steamy clan politics, or the rebel leadership's often bizarre and batty notions, nor of the murky deals in which all sides are engaged.
It sounds like the things you wanted to do at first, such as lending to marijuana businesses, were based on the notion that it would remain a murky industry that banks would stay away from – a notion that might not hold if pot becomes more broadly legal.
In the mainstream media, the recent standard for pursuing open secrets has been murky, but generally guided by the notion that private behavior matters when it is at odds with public declarations.
The Russian assertion, denied by British officials, seemed to revive a theory that the British intelligence services played a murky role in the killing — a notion voiced at the time by some in Moscow to deflect allegations of the Kremlin's involvement in the murder.
But public opinion is murky.
