Both Uses

loath
in
Miss Peregrine's Home for Peculiar Children
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But my mother was loath to pass up even the flimsiest excuse for a celebration—she once invited friends over for our cockatiel's birthday—in part because she loved to show off our house.†
p. 56.3 *

loath = reluctant or unwilling to do something
Joining me would be Emma, who flatly refused to let me go alone, Bronwyn, who was loath to anger Miss Peregrine but insisted that we needed her protection, and Enoch, whose plan we were to carry out.†
p. 284.6

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)