The phrase "a rather nebulous" is correct and usable in written English.
It can be used to describe something that is vague, unclear, or lacking definite form or limits.
Example: "The concept of success can often feel a rather nebulous idea, varying greatly from person to person."
Alternatives: "somewhat unclear" or "rather vague".
"Originally, abortion was grounded in the right to privacy, which is, frankly, a rather nebulous concept in constitutional history.
And though M.L.S. still has a rather nebulous working relationship with Germany's Bundesliga, do not expect to see one of the two finalists in the UEFA Champions League match (Saturday at Wembley Stadium in London) squaring off.
'We're a very small practice, we take a lot of individual interest in our patients, and I think that has helped them to stop smoking more than sending them off in a rather nebulous way to a place where they learn en masse to stop smoking (GP5)'.
As a former Christian and theology graduate, I felt reasonably well qualified to argue my point about blasphemy, but sex is a whole other area – what is acceptable here is a rather more nebulous concept, of course, and there is little objective legislation to help us in matters of taste.
Unrest in Kaska country seems also to have affected the rather nebulous state of Azzi-Hayasa, a client kingdom farther to the east on the upper Lycus River.
There has always been a moral aspect to green thinking, but for years, in perception at least, it was based around rather nebulous and dubious ideas such as respect for nature as a thing valuable in itself.
The challenge, of course, is avoiding the sonic equivalent of mutton dressed as lamb, or a record that adapts sounds from so many places that Usher's personality – often rather nebulous on record – evaporates completely.
Local authorities can fill gaps in the private networks, but only if they decide, on rather nebulous social grounds, that the service is inadequate.
But there is lingering uneasiness here -- and not just among Mrs. Arroyo's opponents -- about her use of the rather nebulous concept of rebellion to arrest political rivals.
For the career futurologist, however, the moral of the story might be to make parsimonious and rather nebulous prognostications, and to sit on the fence wherever possible.
The law defines the rather nebulous concept as "spreading information aimed at forming non- traditional sexual behaviour among children, suggesting this behaviour is attractive, and making a false statement about the socially equal nature of traditional and non-traditional relationships".
