Difference between Significant and Portentous

SIGNIFICANT vs PORTENTOUS: NOUN

Deserving to be considered; important; momentous.
Fitted or designed to signify or make known somethingl having a meaning; standing as a sign or token; expressive or suggestive.
Of or relating to observations or occurrences that are too closely correlated to be attributed to chance and therefore indicate a systematic relationship.
The figures which remain to any number, or decimal fraction, after the ciphers at the right or left are canceled. .
Having or likely to have a major effect; important.
Having or expressing a covert or nonverbal meaning; suggestive.
Having or expressing a meaning.
Rich in significance or implication
Fairly large
Too closely correlated to be attributed to chance and therefore indicating a systematic relation
Fairly large in amount or quantity.
Signifying something; carrying meaning.
Having a low probability of occurring by chance (for example, having high correlation and thus likely to be related).
Reasonably large in number or amount
Having a noticeable or major effect; notable
Having a covert or hidden meaning
Important in effect or meaning

Ominously prophetic.
Hence: Monstrous; prodigious; wonderful; dreadful.
Of the nature of a portent; containing portents; foreshadowing, esp. foreshadowing ill; ominous.
Marked by pompousness; pretentiously weighty.
Full of unspecifiable significance; exciting wonder and awe.
Of the nature of or constituting a portent; foreboding.
Puffed up with vanity
Of momentous or ominous significance
Of ominous significance

Important; notable; weighty; more strictly, important for what it indicates, but also, often, important in its consequences: opposed to insignificant: as, a significant event.
Serving as a sign or indication; having a special or covert meaning; suggestive; meaning: as, a significant gesture; a significant look.
Of considerable importance, size, or worth
Signifying something; conveying a meaning; having a purport; expressive; implying some character, and not merely denotative: as, a significant word or sound.

Earthshaking, Epochal, Momentous, Fundamental, Key, Remarkable, Important, Big, Profound, Meaningful, Monumental, Noteworthy, Large, Considerable, Substantial

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

Earthshaking, Epochal, Momentous, Fundamental, Key, Remarkable, Important, Big, Profound, Meaningful, Monumental, Noteworthy, Large, Considerable, Substantial

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

We have incurred significant net losses since our inception and we may continue to experience significant net losses in the future.
As it emerges as both a significant inward and a significant outward FDI country, China is adopting new approaches to international investment agreements.
These significant entity IGs, or significant entity management where applicable, are only required to submit a final legal representation letter and Management Schedule.
Energy and Consumers have significant obligations under these plans and hold significant assets in these trusts.
Valuations derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable.
Significant Figures Worksheet; Significant Figures Handout Atoms and the Periodic Table Handouts.
Significant related party transactions not Significant numbers of bank accounts located in tax haven jurisdictions.
No person receives a significant settlement unless they have suffered real and significant injuries.
Significant contractor effort and significant Government monitoring is not sufficient to overcome difficulties.
No Significant Significant Significant Impact Impact with Impact Mitigation XIV.

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.