unfavourable

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.

Source: https://en.wiktionary.org/wiki/unfavourable