of the nature of a portent; momentous.

ominously significant or indicative

a portentous defeat.

marvelous; amazing; prodigious.

adjective

alarming , amazing , apocalyptic , astounding , augural , destined , doomed , exhilarating , extraordinary , fated , fateful , haunting , ill-boding , ill-fated , impending , important , inauspicious , inspiring , intriguing , ominous , phenomenal , premonitory , prophetic , remarkable , suggestive , threatening , thrilling , apocalyptical , baneful , dire , direful , fire-and-brimstone , grave , hellfire , unlucky , exciting , foreboding , looming , monstrous , pompous , pretentious , prodigious , significant , weighty