From Middle English lithen, from Old English līþan, from Proto-Germanic *līþaną, from Proto-Indo-European *leyt- ("to go, depart, die"). Cognate with North Frisian lyen, lije, Dutch lijden ("to suffer, dree, abide"), German leiden ("to suffer, brook, permit"). See also lode, lead.
From Middle English lithe, from Old English līþe ("gentle, mild"), from Proto-West Germanic *linþ(ī), from Proto-Germanic *linþaz, from Proto-Indo-European *lentos. Akin to Saterland Frisian lied ("thin, skinny, gaunt"), Danish and archaic German lind. Not attested in Gothic. Some sources also list Latin lenis and/or Latin lentus as possible cognates.
From Middle English lithen, from Old English līþian, līþiġian, from Proto-Germanic *linþijaną, from Proto-Indo-European *lento-. Cognate with German lindern ("to alleviate, ease, relieve").
From Middle English lithen, from Old Norse hlýða ("to listen"), from Proto-Germanic *hliuþijaną, from Proto-Indo-European *ḱlewe-. Cognate with Danish lytte ("to listen"). Related to Old English hlēoþor ("noise, sound, voice, song, hearing"), Old English hlūd ("loud, noisy, sounding, sonorous"). More at loud.