"rather unlikely that" is a correct and usable phrase in written English.
It can be used to express the idea that something is unlikely to happen or be true. For example: "Given the current political climate, it is rather unlikely that the two sides will come to an agreement soon".
By that standard, it seems rather unlikely that Professor X himself could write an A paper for his own class.
It's rather unlikely that this is the moment frantic Republicans are going to clean up their act.
It's rather unlikely that he knew it, but he was quoting, almost verbatim, another boxer, one who'd fought and died two millenniums earlier.
"It's rather unlikely that sweating and starving Cubans go rioting in the streets, even less so against a government that has been effective in disaster preparation and response," said Johannes Werner, editor of Cuba Trade and Investment News.
However, we considered it to be rather unlikely that a clinically relevant cerebral pathology would remain unnoticed at 3 months.
In our opinion it is rather unlikely that this is related to differences in postoperative rehabilitation between the groups.
Likewise, trials suggest that for the inner loop it is rather unlikely that more than two iterations are required.
It seems rather unlikely that the firing of bullets - rubber or otherwise - could survive any interpretation of Kant's categorical imperative.
However, for the carbon particles used in this study, it is rather unlikely that mass transfer enhancement takes place due to the well-known shuttle or grazing effect.
However, since the European diesel car boom started already before the millennium and only after 2009, almost all cars became equipped with filters ex works is rather unlikely that a majority of diesel cars own a filter so far.
In the present non-dominated framework, however, it appears questionable but indeed rather unlikely that such a worst-case measure (bar {P}) exists in (mathcal {R}) for general claims.
