The phrase "ruinous effect" is correct and can be used in written English.
It means to have a damaging or destructive influence or outcome. Example: The company's decision to cut corners had a ruinous effect on their reputation and ultimately led to the loss of many customers.
The departure in January of the executive chairman, Nicola Cortese, seemed to have a ruinous effect.
Soot from the fires had invaded the stacks in the Library of Congress, with ruinous effect.
Here, in works like "Swimming, Smoking, Crying" and "Shaking, Cooking, Peeing," Ms. Schutz's protagonists multitask to ruinous effect.
But his determination to squeeze out the competition has had a ruinous effect in an unlikely place – his home town.
She has moved into her mother's garden shed, neglected personal grooming to ruinous effect and passes the time making short films that star her endlessly bickering thumbs.
Why not a beer like Stone Ruination I.P.A., so-called, the brewery proudly asserts, because of the ruinous effect of "this massive hop monster" on your palate.
Community initiatives could help get rid of dynamite-fishing and its ruinous effects.
Sifma officials point to this affair as proof that messing with housing finance can have ruinous effects.
Technologies including genetic modification "may give excellent results in the laboratory, may be advantageous for some, but have ruinous effects for others", he argued.
In the last quarter of the 20th century, Afghanistan suffered the ruinous effects of civil war greatly exacerbated by a military invasion and occupation by the Soviet Union (1979 89).
Tomorrow, the ruinous effects of Louisiana's inadequate public defense funding, leaving real estate and adoption attorneys – and even prosecutors – to fill the gaps.
