The phrase "a fundamental doubt" is correct and usable in written English.
It can be used when expressing a deep or essential uncertainty about a particular issue or situation.
Example: "Despite the evidence presented, there remains a fundamental doubt about the validity of the findings."
Alternatives: "a core uncertainty" or "a basic question".
But they're also left with a more fundamental doubt: Maybe the human mysteries of chemistry and attraction aren't problems big data can solve.
Not surprisingly, reports on the deliberations of the council stressed the unanimity of panelists' views; apparently few members expressed any fundamental doubts about the wisdom of the project they were considering.
The fact that the FNR does not reduce with increasing experience raises a fundamental biological doubt over the mechanistic model of lymphatic spread on which SNB is based.
Gloom in polderland Publish and be threatened Angela's vision ReprintsAll along the fundamental doubt remains.
That fundamental doubt pertains particularly to actions that affect persons in the far future, such as the disposal of radioactive waste that remains hazardous for millennia.
The failure of oversight by Enron's directors, many of whom are financially sophisticated, has left fundamental doubt in many investors' minds about how vigilant boards are on behalf of shareholders.
Raised in a conventional Christian home, Mead struggled during his years at Oberlin and Harvard with a loss of certainty as fundamental doubts about religion in general and Christianity in particular produced a personal spiritual crisis.
He contended that the forensic team had failed to "resolve fundamental doubts" by not having recovered a bone fragment in the back of the skull that had formed what appeared in the original autopsy report to be a second exit wound, he said.
There are fundamental doubts that it can ever recover fully from a banking crisis and recession that laid Britain lower than many other rich countries.
And there are more fundamental doubts.
