Use the adjective auspicious for a favorable situation or set of conditions. If you start a marathon by falling flat on your face, that's not an auspicious start.

If something seems likely to bring success — either because it creates favorable conditions or you just consider it a lucky sign — label it auspicious. The word is related to auspice, "a divine omen," an old word with a colorful history. In Latin, an auspex was a person who observed the flight of birds to predict things about the future. Luckily, you no longer have to be a bird-watching fortune-teller to guess whether something is auspicious or not.

Definitions of auspicious

adj auguring favorable circumstances and good luck

“an auspicious beginning for the campaign”
bright, hopeful, promising
full or promise
fortunate, rosy
presaging good fortune
presenting favorable circumstances; likely to result in or show signs of success
inauspicious, unfortunate
not auspicious; boding ill
unlikely to bring about favorable results or enjoyment
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