unfavorable

Short definition from Wiktionary

Adjective

1. 1
   Serving to hinder or oppose; adverse, disadvantageous, inconducive, unsuitable.
2. 2
   Not auspicious; ill-boding.
3. 3
   Of a belief, state of mind, etc.: not favourable; disapproving.
4. 4
   Of wind or weather: causing delay or obstacles; not conducive to travel or work; inclement.