Analysis of Final Answer

In the "final answer" there is a fatal flaw.
Nothing is forever
so this sticks in one's craw.
In the "final answer" there is a shifting sand.
Nothing is unchanging
so this plays secondhand.
In the "final answer" there is a false outcome.
Nothing is absolute
so this shows a ho-hum.
In the "final answer" there is a major fault.
Nothing is unblemished
so this becomes assault.
In the "final answer" there is a thin disguise.
Nothing is consummate
so this touts a surmise.
In the "final answer" there is a house-of-cards.
Nothing is unshaken
so this promotes canards.