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Adjective: unpropitious  ,ún-pru'pi-shus
  1. Unfavourable; not conducive to success
    "The weather was unpropitious for the outdoor event"

See also: auspiciousness, ill, inauspicious, ominous, propitiousness, thunderous, unfavorable [US], unfavourable [Brit, Cdn]

Antonym: propitious