Source : WordNet®

unfavourable
     adj 1: not encouraging or approving or pleasing; "unfavorable
            conditions"; "an unfavorable comparison"; "unfavorable
            comments" [syn: {unfavorable}] [ant: {favorable}]
     2: (of winds or weather) tending to hinder or oppose;
        "unfavorable winds" [syn: {unfavorable}] [ant: {favorable}]