Difference between Foreboding and Portentous

FOREBODING vs PORTENTOUS: NOUN

Ominous.
Of ominous significance; serving as an ill omen; foretelling of harm or difficulty.
Ominously prophetic

Of momentous or ominous significance
Of ominous significance
Puffed up with vanity
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; containing portents; foreshadowing, esp. foreshadowing ill; ominous.
Hence: Monstrous; prodigious; wonderful; dreadful.
Ominously prophetic.

Omen, Vibe, Fear, Feeling, Apprehension, Anxiety, Trepidation, Dread, Prophetical, Fateful, Boding, Prophetic, Premonition, Portentous, Presentiment

Ponderous, Lugubrious, Ominous, Significant, Important, Prodigious, Overblown, Fateful, Pontifical, Prophetical, Pretentious, Pompous, Prophetic, Foreboding, Grandiloquent

Hunch, Presage, Omen, Vibe, Fear, Feeling, Anxiety, Trepidation, Dread, Prophetical, Fateful, Boding, Prophetic, Portentous, Presentiment

Ponderous, Lugubrious, Ominous, Significant, Important, Prodigious, Overblown, Fateful, Pontifical, Prophetical, Pretentious, Pompous, Prophetic, Foreboding, Grandiloquent

Let us test this portentous bond, and see just how fast it holds!
Probably no ship in modern history has carried a more portentous freight.
Never did such portentous shot holes perforate the carcass of any quarry.
They returned smiting their breasts, in anguish portentous of destruction.
Some portentous truth was seeking for admittance to my brain.
Of course the great event had its portentous accompaniments.
Anno domini one or more portentous asset purchases and.
The slavery question now began to assume portentous magnitude.
On 17 October, there will be a portentous conjunction.
SYN: Predictive, ominous, portentous, premonitory, fatidical, oracular, sibylline.