"rather fluent" is correct and can be used in written English.
It means being able to speak or write a language smoothly and easily, with few mistakes. It can be used to describe someone's language abilities or to compare it to someone else's. Example: "She was rather fluent in Spanish, effortlessly carrying on a conversation with the locals."
A poem is read as if it were an alibi that is rather too fluent to be entirely trusted.
Without him, and with a less predictable game plan, Brazil looked rather more fluent, but they still lacked the guile to break down a dogged Paraguay in the quarter-final.
But the number of chances were outweighed by the number of bookings - eight in total - as the game continued to be feisty rather than fluent.
If you've seen Christie's show then the material here will be familiar although, stitched together with tales of her Irish Catholic upbringing and her struggles in stand-up, the narrative is fluent rather than episodic.
22 of them spoke Czech, but the system didn't let me filter for those who were fluent, rather than beginner level.
Consistent with figure sculpture in other parts of India, these figures were fluent rather than defined in their musculature, and the drapery was reduced to a few visible lines on the body of the image.
Thus, the segregation into principal components between scans in a subject did not follow a fixed scheme but was rather characterized by fluent changes.
The fact that he speaks fluent English rather than stumbling Texan gives him an added air of authority.
"I was so glad that a playwright was adapting my play, rather than a scholar fluent in English and in Russian," she said.
They were far from fluent and rather error-prone at times but they still found a way to prevail against a side who had forgotten what it feels like to concede a goal, let alone ship a result.
