All 5 Uses

loath
in
Beowulf - (translated by: Gummere)
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III THUS seethed unceasing the son of Healfdene with the woe of these days; not wisest men assuaged his sorrow; too sore the anguish, loathly and long, that lay on his folk, most baneful of burdens and bales of the night.†
No living man, or lief or loath, from your labor dire could you dissuade, from swimming the main.†
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loath = reluctant or unwilling to do something
How much awaits him of lief and of loath, who long time here, through days of warfare this world endures!†
But the warrior found the light-of-battle {22a} was loath to bite, to harm the heart: its hard edge failed the noble at need, yet had known of old strife hand to hand, and had helmets cloven, doomed men's fighting-gear.†
No living thing would that loathly one leave as aloft it flew.†

Definitions:

(1) (loath)
reluctant or unwilling to do something

Word Confusion: Do not confuse loath with loathe which sounds very similar or the same. Loath is typically used as an adjective while loathe is a verb that means "to dislike greatly".
(2) (meaning too rare to warrant focus)