ETYM Old Eng. looth, loth, as. lâth hostile, odious; akin to os. lâth, German leid, Icel. leithr, Swed. led, German leiden to suffer, Old High Germ. lîdan to suffer, go, cf. as. lîthan to go, Goth. leipan, and Eng. lead to guide.
Unwillingness to do something contrary to one's custom; SYN. loth, reluctant.