portentous

adj

Of momentous or ominous significance. / Ominously prophetic. / Puffed up with vanity.

The dark clouds gathering in the sky were a portentous sign of the impending storm.

意味（1）

Of momentous or ominous significance.

Well may it sort [be fitting] that this portentous figure comes armed through our watch, so like the King that was and is the question of these wars.

意味（2）

Ominously prophetic.

意味（3）

Puffed up with vanity.