unfavourable

Etymology

From un- + favourable.

adj

1. Serving to hinder or oppose; adverse, disadvantageous, inconducive, unsuitable.
   The shade of a dense pine wood, is more unfavorable to the springing up of pines of the same species than of oaks within it. 1863, Henry David Thoreau, chapter 6, in Excursions
2. Not auspicious; ill-boding.
   The fact that the bride went through the ceremony without her bridal bouquet is looked upon by many as an unfavorable omen. 1903, Anna Katharine Green, chapter 6, in The Filigree Ball
3. Of a belief, state of mind, etc.: not favourable; disapproving.
4. Of wind or weather: causing delay or obstacles; not conducive to travel or work; inclement.
   The wind was right under the land, the tide unfavorable. 1855, Herman Melville, chapter 17, in Israel Potter