Old English laðian "be hateful or displeasing," from lað "hated; hateful" (see loath). Cognate with Old Saxon lethon "be evil or hateful," Old Norse leiða "disgust." Main modern sense of "to hate, be disgusted with" is attested by c. 1200. Impersonal use (it loathes me = "I am disgusted with it") persisted through 16c. Related: Loathed; loathing.