UNFAVOURABLE
disadvantageous, unfavorable, unfavourable
(adjective) involving or creating circumstances detrimental to success or effectiveness; “a disadvantageous outcome”; “a well-known study from the 1970’s showed that gender stereotyping placed women in a disadvantageous position”; “made an unfavorable impression”
unfavorable, unfavourable
(adjective) (of winds or weather) tending to hinder or oppose; “unfavorable winds”
unfavorable, unfavourable
(adjective) not encouraging or approving or pleasing; “unfavorable conditions”; “an unfavorable comparison”; “unfavorable comments”; “unfavorable impression”
Source: WordNet® 3.1
Etymology
Adjective
unfavourable (comparative more unfavourable, superlative most unfavourable) (British spelling)
Serving to hinder or oppose; adverse, disadvantageous, inconducive, unsuitable.
Antonym: favourable
Not auspicious; ill-boding.
Synonyms: inauspicious, unfortunate, Thesaurus:unlucky
Antonyms: favourable, fortunate, Thesaurus:lucky
Of a belief, state of mind, etc.: not favourable; disapproving.
Synonym: favourable
Of wind or weather: causing delay or obstacles; not conducive to travel or work; inclement.
Usage notes
Nouns to which unfavourable is often applied: condition, circumstance, weather, climate, outcome, result, opinion, view, impression, effect, consequence, impact, influence, environment, balance, information, report, prognosis, rating, evaluation, review, position, factor, feature, aspect, reaction, response, attitude, season, development, treatment, ruling, case, state, experience, inference.
Source: Wiktionary