1. not encouraging or approving or pleasing

- unfavorable conditions

- an unfavorable comparison

- unfavorable comments

Similar word(s): negative, critical, uncomplimentary, admonishing, admonitory, reproachful, reproving, adverse, inauspicious, untoward, disapproving, discriminatory, invidious, bad, hostile, unfavourable

2. (of winds or weather) tending to hinder or oppose

- unfavorable winds

Similar word(s): unpropitious, adverse, contrary, unfavourable

3. involving or creating circumstances detrimental to success or effectiveness

- made an unfavorable impression

Similar word(s): minus, negative, inexpedient, harmful, inopportune, disadvantageous, unfavourable