Antonyms of adj auspicious

1 sense of auspicious

Sense 1
auspicious (vs. inauspicious) -- (auguring favorable circumstances and good luck; "an auspicious beginning for the campaign")

inauspicious (vs. auspicious), unfortunate -- (not auspicious; boding ill)
        => unpromising -- (unlikely to bring about favorable results or enjoyment; "faced an unpromising task"; "music for unpromising combinations of instruments")

Similarity of adj auspicious

1 sense of auspicious

Sense 1
auspicious (vs. inauspicious) -- (auguring favorable circumstances and good luck; "an auspicious beginning for the campaign")
       => bright, hopeful, promising -- (full or promise; "had a bright future in publishing"; "the scandal threatened an abrupt end to a promising political career"; "a hopeful new singer on Broadway")
       => fortunate, rosy -- (presaging good fortune; "she made a fortunate decision to go to medical school"; "rosy predictions")
          Also See-> propitious#1