Might mean (unverified): Harmful and wicked in nature.
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We found one dictionary that defines the word nefastous:

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  1. nefastous: Wiktionary

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Definitions from Wiktionary (nefastous)

▸ adjective:  (rare) inauspicious, disastrous, ill-omened

Similar:
ill-omened, disastrous, infaust, nefast, maleficial, funeste, inauspicate, ill-fated, disadventurous, disadvantageable, more...

Opposite:
auspicious, favorable, fortunate, lucky, promising

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Similar:
ill-omened, disastrous, infaust, nefast, maleficial, funeste, inauspicate, ill-fated, disadventurous, disadvantageable, more...

Opposite:
auspicious, favorable, fortunate, lucky, promising



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