Antonyms of adj propitious

1 sense of propitious

Sense 1
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")

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")

Similarity of adj propitious

1 sense of propitious

Sense 1
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")
          Also See-> auspicious#1; favorable#2, favourable#2

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