unfavorable vs disadvantageous

unfavorable and disadvantageous both are adjectives.

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

As adjectives, unfavorable and disadvantageous are synonyms defined as:

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

Other synonyms of unfavorable include unfavourable.

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