adjective
1.
Synonyms: pernicious , deadly, noxious, pestiferous, pestilent, pestilential
Related Word: injurious; insalubrious, noisome, unhealthy, unwholesome
Contrasted words: benign, favorable, propitious; advantageous, helpful, profitable; healthful, salubrious, salutary, wholesome
Antonyms: beneficial
2.
Synonyms: ominous , apocalyptic, baleful, dire, direful, fateful, ill-boding, ill-omened, threatening, unpropitious