"unreasonable assumption" is correct and usable in written English.
You can use it when referring to a belief, opinion, or idea that is not based on evidence. For example: "It was an unreasonable assumption to believe that our plan would be completely successful on the first attempt."
This is not an unreasonable assumption.
"Yeah, ah, that's not an unreasonable assumption".
It is not an unreasonable assumption.
This is referred to as "unreasonable assumption of risk".
"And that does seem to have been an unreasonable assumption".
When a child sees the girlfriend in a picture frame on his desk, she asks, "Is that your maid?" It was not an unreasonable assumption.
To make matters worse, the conclusions expressed in this year's Medicare report were, to our minds, based on unreasonable assumptions that produced unrealistic and misleading results.
The Medicare agency contends that it does not have the legal authority to force insurers to return money to beneficiaries or to the Medicare trust fund when auditors find "errors, incorrect or unreasonable assumptions or other misstatements" in company bids.
The long-accepted subdivision of the double layer at the metal electrolyte interface into compact and diffuse regions, resulting in Grahame's construction of a concentration-independent compact layer capacity, is shown to be a consequence of certain unreasonable assumptions and approximations.
Thus, these burst construction solutions make unreasonable assumptions and do not comply with the IEEE 802.16 specifications.
In fact, some understand the concepts well, particularly not making unreasonable assumptions about growth to juice valuations and providing clear financial statements audited by a major financial firm.
