The word 'lenience' is correct and usable in written English.
You can use it to describe a situation where someone or something is being treated in a merciful, forgiving, lenient, or tolerant way. For example, "The judge showed lenience towards the defendant by giving him only a suspended sentence."
American officials have expressed growing frustration at the government's apparent lenience.
Several conservative pundits who had been implacably opposed to anything that smacked of lenience towards illegal immigrants are suddenly declaring themselves untroubled by the idea.
The bank's capital base had been insufficient to absorb heavy losses, in part because of regulatory lenience.
It was a statement of lenience, and of harsh rebuke to the Labour Party (if I recall correctly, Andy Burnham looked as though he had just received a smack in the face – something that should not be forgotten too quickly, considering what he'd apparently wanted all along had just come to pass).
Atkinson also showed lenience to Liverpool when ignoring Alberto Moreno's penalty-box tug on Romelu Lukaku.
Nana's mother's joy in these children, her father's reputed amused lenience, stung Nana.
(Bach's cool resistance to the "often slavish lenience" of her rehabilitators is an exception).
Judge Richard A. Jones of United States District Court — referring to a letter that Mr. Harris-Moore, now 20, wrote seeking lenience in his sentencing — said that the defendant wrote as well as someone with "a masters in journalism," a fact the judge said might seem in conflict with Mr. Harris-Moore's limited education.
Just as Cantona and Gascoigne were decades before him, Balotelli has been afforded lenience by virtue of his exceptional talent.
Rabbi Glanz broke down in sobs as he asked for lenience before about a dozen supporters and family members in the largely empty courtroom.
At the height of the sexual abuse crisis last spring, Benedict's defenders said he had long argued for disciplining priests who had been found guilty of grave misconduct, while other Vatican officials advocated more lenience.
