portentous

Of the nature of or constituting a portent; foreboding.

Full of unspecifiable significance; exciting wonder and awe.

Marked by pompousness; pretentiously weighty.

Of the nature of a portent; ominous; foreshowing ill.

Monstrous; prodigious; wonderful.

Of the nature of a portent; containing portents; foreshadowing, esp. foreshadowing ill; ominous.

Hence: Monstrous; prodigious; wonderful; dreadful.

Of momentous or ominous significance.

Ominously prophetic.

Puffed up with vanity.