Someone or something described as lenient is not harsh, severe, or strict. In other words, they allow a lot of freedom and leeway, and do not punish or correct in a strong way.

// The teacher was lenient in her grading after the holiday break.

// Some concerned citizens felt the punishment was too lenient.

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“In the adult section of the library, the patrons arrived generally by themselves. … If they did something as human as nodding off, they would be kicked out immediately. … The children’s section was a little more lenient when it came to rules. A child would be splayed on the floor staring at the ceiling with their mittens and boots lying around them as though they were pieces of them that had broken off. There were children playing Battleship. There would be a child sitting in a chair shaped like a giant hand, reading up on the increasingly absurdly horrific circumstances of orphans while eating a box of Goldfish crackers.” — Heather O’Neill, “Lite-Brite Times Square,” Good Mom on Paper: Writers on Creativity and Motherhood, 2022

If you’ve ever had a peaceful, easy feeling—perhaps brought on by someone who you know won’t let you down—then you’ll have no problem understanding the earliest meaning of lenient. When it entered English in the mid-1600s, lenient described something soothing—such as a medication—that relieved pain or stress, or otherwise enabled someone to take it easy. For a brief window of time it was even used as a noun, referring to any of various ointments and balms that help heal wounds in the long run. Lenient comes from the Latin verb lenire, meaning “to soften or soothe,” which in turn comes from the adjective lenis, meaning “soft or mild.” The “soothing or easing” sense of lenient is still in use today, but English speakers are more likely to apply it to someone who is lax with the rules (as in “a lenient professor”), who doesn’t mind when someone acts like a certain kind of fool or takes it to the limit one more time.