Evanescent fulgor, no room left for existential doubt

Evanescent (adjective)

Soon passing out of sight, memory, or existence; quickly fading or disappearing; Denoting a field or wave which extends into a region where it cannot propagate and whose amplitude therefore decreases with distance.

Lexico

Existential (adjective)

Of or relating to existence

Dictionary.com

Fulgor (noun)

Splendor; brightness.

Wordsmith

Futile vicissitudes, false pos assurance, life still drifts away

Futile (adjective)

Incapable of producing any useful result; pointless

WordThink

Pos (adjective)

Positive (in various senses); certain (esp. in that’s pos)

Oxford English Dictionary

Vicissitudes (plural noun)

Successive, alternating, or changing phases or conditions, as of life or fortune; ups and downs

Dictionary.com

Time’s retinue reneges trust, dillusionment holds my mind

Disillusion (noun and verb)

Noun: Disappointment resulting from the discovery that something is not as good as one believed it to be. 
Verb: Cause (someone) to realize that a belief they hold is false.

Lexico

Renege (verb and noun)

verb: Fail to fulfill a promise or obligation;
noun: The mistake of not following suit when able to do so

The New York Times

Retinue (noun)

A group of retainers or attendants

Merriam-Webster

Alas this life of sempiternal serendipity

Horologium (noun)

A timepiece, as a clock or sundial, or a building supporting or containing a timepiece.

Dictionary.com

Sempiternal (adjective)

Of never-ending duration : eternal

Merriam-Webster

Serendipity (noun)

The faculty of making fortunate discoveries by accident

WordThink

Her heterodox surrender was to codify
Against her vulgarian jailer - goodbye.

Codify (verb)

Arrange (laws or rules) into a systematic code.  Arrange according to a plan or system.

Lexico

Heterodox (adjective)

Contrary to or different from an acknowledged standard, a traditional form, or an established religion : unorthodox, unconventional; holding unorthodox opinions or doctrines

Merriam-Webster

Vulgarian (noun)

A boorish, lewd, and crude person who makes a conspicuous display of wealth.

WordSmith

His parsimounious dalliances mocked
Her fortitude, her patience, her pride
Til nothing remained, nothing shocked.
Silence filled her ears, regretful bride.

Dalliance (noun)

A casual romantic or sexual relationship.

Lexico

Fortitude (noun)

Strength of mind that enables a person to encounter danger or bear pain or adversity with courage

Merriam-Webster

Parsimounious (adjective)

Excessively unwilling to spend money

The New York Times

Controverted over rooms cluttered,
the connoisseur of drink, dish, and talk
And his obfuscated wife, shuttered
and fearful of who gawked.

Connoisseur (noun)

An expert who is knowledgeable enough to pass critical judgment in a field, especially in fine arts, cuisines, etc.

WordSmith

Controvert (verb)

To argue about; debate; discuss

Dictionary.com

Obfuscate (verb)

Render obscure, unclear, or unintelligible. Bewilder (someone).

WordThink

Recondite heart fluttered and wild
In trepidation of words unuttered.
To her calliblephary he never smiled,
Wordlessly he sighed, nothing muttered.

Calliblephary (noun)

A cosmetic for enhancing the appearance of the eyes; eyeshadow

Oxford English Dictionary

Recondite (adjective)

Difficult or impossible for one of ordinary understanding or knowledge to comprehend : deep; of, relating to, or dealing with something little known or obscure; hidden from sight : concealed

Merriam-Webster

Trepidation (noun)

A feeling of fear or agitation about something that may or may not actually happen

Wordthink