The phrase "ambiguous without" is correct and usable in written English.
It can be used to describe a part of a sentence that is unclear or can have multiple interpretations without additional context or information. Example: The instructions for the experiment were ambiguous without the diagrams to illustrate the steps. In this sentence, the phrase "ambiguous without" is used to convey that the instructions were not clear unless there were diagrams to accompany them. Without the diagrams, the instructions could be interpreted in various ways, making them ambiguous.
But pressed to come up with an example of a series that was unambiguously ambiguous without the serial comma I couldn't think of a good one.
The answer, after the published data, is still ambiguous without any confirmed and clear scientific answer.
In most recent large-animal studies, the diagnosis of experimental ARDS is ambiguous without definite criteria [12, 18, 21, 22].
In Haskell, an expression is considered as ambiguous without conformance to the existence of two or more distinct derivations of the same type for this expression.
Nanoparticle reinforcement at low and moderately high loadings has been assigned to the hydrodynamic and networking effects, respectively while the conclusions are ambiguous without specifying the "frequency -dependent polymer dynamics.
"I was mistaken for a girl as a child," he says, "and when I started becoming more in control of my image as a teenager, I looked very ambiguous without actually intending to.
Pictures without words are often ambiguous; words without pictures, lame.' He laid the lie that 'a picture is worth a thousand words' by insisting that without the added context, an image is open to misinterpretation, even to deliberate misuse.
Much of the time, therefore, we function in an ambiguous zone, without clear-cut answers.
Each Monday morning, the blog posts an interesting and ambiguous photograph without a caption or other identifying details.
Each was grateful for the other's casualness; the fact that they did not need to explain their absences to each other kept them ambiguous, almost without meaning, as they'd been over the years when, late coming home from the office, Audie had said, "I was held up".
In order that prevalence beliefs might play a role in diagnosis, the cases were intended to be ambiguous and without a "right" diagnosis at this initial stage; if the symptoms clearly pointed to one diagnosis, there would be no remaining influence of prevalence.
