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Definition of portentous:

  1. Ominous; foreshowing ill; wonderful, in an ill sense.

Synonyms:

ominous, astonishing, surprising, august, deterrent, grand, prophetic, minatory, magniloquent, sublime, ceremonious, alarming, ill, diffuse, grandiloquent, astounding, economical, baneful, cautionary, staggering, fire-and-brimstone, prodigious, warn, articulate, tall, doomy, shocking, apocalyptical, clean, inauspicious, consulting, forewarned is forearmed, apostolic, ominous, majestic, wondrous, pretentious, momentous, luck, hellfire, pompous, apostolical, dread, unlucky, apocalyptical, wonderful, appalling, fabulous, crisp, colossal, exceptional, consultative, baleful, dire, eye-opening, stunning, pontifical, direful, threatening, awful, apocalyptic, stately, circuitous, imposing, foreboding, stupendous, terrible, significant, surpassing, noble, dreadful, episcopal, grave, chatty, solemn, miraculous, menacing, terrific, advisory, declamatory, discursive, prophetical, overblown, amazing, fearful, frightful, horrible, warning, conversational, exceeding, fateful, papal, important, sinister, expert, ill-boding, awesome, olympian.

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