The phrase "are frequently uncertain" is correct and usable in written English.
It can be used to describe situations, conditions, or states that lack clarity or certainty on a regular basis.
Example: "The outcomes of the experiments are frequently uncertain, leading to challenges in drawing definitive conclusions."
Alternatives: "are often unclear" or "are regularly ambiguous."
Professors who copy material for use in class are frequently uncertain whether or not they need to seek permission, which almost always entails paying a fee.
Nonetheless, drug users are frequently uncertain about their ability to achieve this and can have very different and inconsistent understandings of what being abstinent means.
However, the kind of molecular interactions and the specific biochemical form they take in a cellular process are frequently uncertain.
Moreover there is now a growing appreciation that IBS can occur in healed IBD [ 11, 12] and that without endoscopic examination, the precise cause of symptoms in a patient with IBD is frequently uncertain at any particular point in time.
Despite the fact that hospital staff attempted to replace lights regularly, the lack of a photo radiometer meant that clinicians were frequently uncertain as to the quality of treatment they were providing.
For example, if we read different documents about spatial planning or landscape planning, we find that landscapes are frequently described by rather uncertain and incoherent terms.
Not least because if you do not have any of these things, and you're not lucky enough to be, say, a successful novelist or a software engineer, then society frowns on you, and your prospects are frequently bleak and deeply uncertain.
However, these tasks are complicated because experimental data are typically sparse, uncertain, and are frequently only available in form of qualitative if then observations.
Elevations in the biochemical markers of myocardial damage are frequently detected after percutaneous coronary revascularization, but their clinical significance is still uncertain.
It is frequently cited when people are uncertain about what is at stake in emerging scientific domains.
The pathogenic role of HBoV in RTIs is uncertain because it was frequently detected in symptomatic and asymptomatic children and was commonly found with other viruses in symptomatic children.
