The phrase "a very very solid" is correct and usable in written English.
It can be used to emphasize the strength or reliability of something, often in informal contexts.
Example: "The foundation of the building is a very very solid structure, ensuring its stability for years to come."
Alternatives: "extremely solid" or "highly reliable".
"It's a very, very solid team.
Our course was M.I.T.-hard and needed a very, very solid background.
This is a very, very solid company with good growth potential.
Mr. Iger noted that health food for children had already become "a very, very solid business" for Disney.
"He's got a very, very solid understanding of the restaurant business," said Mitchell A. Kovitz, a principal of the Kovitz Investment Group, which owns about 5 percent of Biglari Holdings stock as well as shares in Berkshire Hathaway.
"I can promise it is going to be a very, very solid offer that we do make because we are going to try," he said of the bargaining with Cano's representatives that will be taking place soon enough.
He prefaced his comment by trying to be hopeful, "We've got a very, very, very solid newsroom and we'll see".
"She's been a tremendous player in our youth system and been very, very solid," Ellis said of Johnston.
— NAILA-JEAN MEYERS We really need some fireworks on the back nine because so far this Masters Sunday has been a snooze, no? — Alan Shipnuck (@AlanShipnuck) 14 Apr 13 Angel Cabrera looks very, very solid as the kids behind him scramble.
At the news conference Wednesday night, the Little Rock police chief, Stuart Thomas, described the case against Mr. Vance as "very, very solid" but was silent as to a motive for the crime and details of the investigation, including exactly how Mr. Vance had become a suspect and how he had learned that he was under suspicion.
That batting is looking very very solid, and I think we'll bat a lot further down the order than people expect".
