loth vs averse

loth and averse both are adjectives.

Word	Noun	Adjective	Verb	Adverb
loth	No	Yes	No	No
averse	No	Yes	No	No

As adjectives, loth and averse are synonyms defined as:

Other synonyms of loth include antipathetic, antipathetical, indisposed, loath.

loth (adjective)	averse (adjective)
(usually followed by `to') strongly opposed	(usually followed by `to') strongly opposed
unwillingness to do something contrary to your custom