unfavorable in WordNet English dictionary

1. (of winds or weather) tending to hinder or oppose
   "unfavorable winds"
   unfavorable  unfavourable 
   
2. not encouraging or approving or pleasing
   "unfavorable conditions"; "an unfavorable comparison"; "unfavorable comments", "unfavorable impression"
   unfavorable  unfavourable 
   
3. not favorable
   "made an unfavorable impression"; "unfavorable reviews"
   unfavorable  unfavourable