adjective
1.
Synonyms: ominous , apocalyptic, baleful, baneful, direful, doomful, ill-boding, inauspicious, threatening, unpropitious
Related Word: important, momentous, significant; conclusive, decisive, determinative; acute, critical, crucial
Contrasted words: inconclusive, insignificant, trivial, unimportant
2.
Synonyms: fatal 2, calamitous, cataclysmic, catastrophic, disastrous, ruinous