loath vs antipathetic

loath and antipathetic both are adjectives.

Word	Noun	Adjective	Verb	Adverb
loath	No	Yes	No	No
antipathetic	No	Yes	No	No

As adjectives, loath and antipathetic are synonyms defined as:

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

loath (adjective)	antipathetic (adjective)
(usually followed by `to') strongly opposed	(usually followed by `to') strongly opposed
unwillingness to do something contrary to your custom	characterized by antagonism or antipathy