The phrase "a rather rough" is correct and usable in written English.
It can be used to describe something that is not smooth, polished, or refined, often in a subjective or qualitative manner.
Example: "The presentation was a rather rough draft, lacking the final touches we had hoped for."
Alternatives: "somewhat coarse" or "fairly unrefined".
At first, Ms. Clinton seemed to be having a rather rough time.
HB Kate Winslet seems to have a rather rough time at the Toronto film festival.
This is the older heart of the city – a rather rough neighbourhood left to decay in fascinatingly human, organic ways.
A harbour city, New Haven has perversely cut itself off from the water with an ugly tangle of freeways, and presents a rather rough, industrial face.
We were, in fact, having a rather rough one — no sudden, sickening drops but a constant bumpiness, as if we were going along a cobblestone road.
Once considered a rather rough fishing village, the area has become gentrified amid an influx of people from the north-east states, bringing with it a relatively new recycling practice and raised property prices.
Theme nights at minor-league ballgames are often silly affairs, and this was no exception: a dance number paid tribute to Daenerys Targaryen, the Mother of Dragons; two mascots were married between innings, then immediately mowed down by water guns, in a rather rough-hewn recreation of the Red Wedding, the most notorious of the many bloodbaths in "Game of Thrones".
This may sound like a rather rough-and-ready way of proceeding; but clearly, in the mere two or three centuries that have elapsed since recognizable science began to come into existence, it has brought us a remarkably long way.
We had a couple of rather rough refereeing decisions, but doesn't everybody?
Amazon's Kindle started out in 2007 as an expensive and rather rough device that garnered little in the way of praise.
The analysis of in-situ data indicates that the conventional thrust force estimation model based on an empirical equation gives rather rough result.
