Antonyms of adj unpropitious

1 sense of unpropitious

Sense 1
unpropitious (vs. propitious) -- (not propitious)

propitious (vs. unpropitious) -- (presenting favorable circumstances; likely to result in or show signs of success; "propitious omens"; "propitious gales speeded us along"; "a propitious alignment of planets for space exploration")
        => golden, favorable, favourable, lucky, prosperous -- (presaging or likely to bring good luck; "a favorable time to ask for a raise"; "lucky stars"; "a prosperous moment to make a decision")
        => gracious -- (disposed to bestow favors; "thanks to the gracious gods")

Similarity of adj unpropitious

1 sense of unpropitious

Sense 1
unpropitious (vs. propitious) -- (not propitious)
       => ill, inauspicious, ominous -- (presaging ill fortune; "ill omens"; "ill predictions"; "my words with inauspicious thunderings shook heaven"- P.B.Shelley; "a dead and ominous silence prevailed"; "a by-election at a time highly unpropitious for the Government")
       => thunderous -- (extremely ominous; "world events of thunderous import")
          Also See-> unfavorable#2, unfavourable#2