Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of portentous is as below...

Ominous :: Ominous (a.) Of or pertaining to an omen or to omens; being or exhibiting an omen; significant; portentous; -- formerly used both in a favorable and unfavorable sense; now chiefly in the latter; foreboding or foreshowing evil; inauspicious; as, an ominous dread..

Prodigious :: Prodigious (a.) Of the nature of a prodigy; marvelous; wonderful; portentous.

Bodeful :: Bodeful (a.) Portentous; ominous.

Portentous :: Portentous (a.) Of the nature of a portent; containing portents; foreshadowing, esp. foreshadowing ill; ominous..

Portentous :: Portentous (a.) Hence: Monstrous; prodigious; wonderful; dreadful; as, a beast of portentous size..

Dire :: Dire (superl.) Ill-boding; portentous; as, dire omens..

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