Etymology
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Words related to lenient

*‌‌lē- 

Proto-Indo-European root meaning "to let go, slacken." 

It forms all or part of: alas; allegiance; lassitude; last (adj.) "following all others;" late; latter; lenient; lenitive; lenity; let (v.) "allow;" let (n.) "stoppage, obstruction;" liege.

It is the hypothetical source of/evidence for its existence is provided by: Greek ledein "to be weary;" Latin lenis "mild, gentle, calm," lassus "faint, weary;" Lithuanian lėnas "quiet, tranquil, tame, slow," leisti "to let, to let loose;" Old Church Slavonic lena "lazy," Old English læt "sluggish, slow," lætan "to leave behind."  

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lenitive (adj.)

"assuaging, palliating," early 15c., from Medieval Latin lenitivus, from Latin lenitus, past participle of lenire "to soften, alleviate, pacify" (from PIE root *‌‌lē- "to let go, slacken"). As a noun, "a lenitive medicine," from early 15c.

leniency (n.)
1780, from lenient + abstract noun suffix -cy.