What is the noun form of the word 'lenient'?

• Lenient (adjective)
English Meaning: more merciful or tolerant than expected, mild or soothing; emollient.
Bangla Meaning: উদার; দয়ালু; কোমল; ক্ষমাশীল:a lenient judge/parent. lenience, leniency (noun(s)) leniently (adverb)

Synonym: sympathetic, compassionate, friendly, merciful, forgiving, patient, gentle, generous.
Antonym: severe, harsh, tough, stern, grim, ruthless, merciless, pitiless, insensitive, thoughtless, inconsiderate.

Other forms: 
• Lenience, Leniency (noun)
• Leniently (adverb)
• Leniencess and Lenientative বলে কোনো শব্দ হয় না।

Source: Bangla Academy Dictionary and Merriam-Webster Dictionary.