"rather reliable" is a correct and usable phrase in written English.
It can be used to describe something or someone that is trustworthy or dependable, but not necessarily completely so. Example: "I find the information in this textbook to be rather reliable, but I still like to cross-check it with other sources."
"Mine is actually rather reliable," wrote Matt Burfield.
Statistics show that the system is rather reliable with an overall data completeness of 98.14% since it began running in 1994.
But just the night before I had heard a rather reliable friend mention the app, which piqued my curiosity.
He listed 149 destructive earthquakes from 34 rather reliable historical materials for the period from 416 ad to 1872.
The class probability estimates are rather reliable in this case and can make a difference as compared to randomly ranking the data.
It was shown that some particularly useful features such as UV Fluorescence, IR Fluorescence and the losses of infrared reflectance in the IRR imaging allow for rather reliable identification of certain pigments.
The SNAP program is one big fish giveaway that leaves people reliant rather than reliable.
The reciprocating compressor allows for rather complete reliable flexibility in applications requiring variable volumetric flow rates and variable pressure ratios.
But there's also something rather comfortingly reliable about it as well and, while a tad workmanlike, his solid direction ensures that the drama is mostly involving.
Also looking to swap something erratic for something rather more reliable are Liverpool, who have gone all weak at the knees over Manchester City's James Milner, while Mario Balotelli could be off to Olympiakos on loan until the end of the season.
He has told the board that he will resign unless the NOF makes clear that the report was purely "opinion", rather than reliable advice to people about their eating habits that was based on good evidence.
