disadvantageous vs unfavourable

disadvantageous and unfavourable both are adjectives.

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

As adjectives, disadvantageous and unfavourable are synonyms defined as:

disadvantageous and unfavourable: involving or creating circumstances detrimental to success or effectiveness

Other synonyms of disadvantageous include unfavorable.

disadvantageous (adjective)	unfavourable (adjective)
involving or creating circumstances detrimental to success or effectiveness	(of winds or weather) tending to hinder or oppose
	not encouraging or approving or pleasing
	involving or creating circumstances detrimental to success or effectiveness