unfavourable vs adverse

unfavourable and adverse both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unfavourable	No	Yes	No	No
adverse	No	Yes	No	No

unfavourable (adjective)	adverse (adjective)
(of winds or weather) tending to hinder or oppose	in an opposing direction
not encouraging or approving or pleasing	contrary to your interests or welfare
involving or creating circumstances detrimental to success or effectiveness