The more the sincere one's effort is, the faster their growth is.
is very close. There are two fixes you need:
you have an extra "the" in the first one. I'll show some examples below.
the subject changes from "one" to "their". This is a violation of parallelism. Parallelism just means that between parts (1) and (2), when things are the ...
The requirements of the question are:
an adjective that describes “freedom” or “liberty”
the word success
This is very difficult.
Not every noun in English has a good adjective form.
Some nouns have good adjectives:
economics — economic (or economical)
ecology — ecological
trees — arboreal
cows — bovine
pigs — porcine
The more the sincere one's effort is, the faster their
one's growth is.
Subject to the corrections I've made, there is nothing grammatically wrong with this sentence. You could replace the analytic "more sincere" by inflectional "sincerer", though many speakers dislike the latter. And some speakers (like me) would prefer plural "efforts".
If you must ...
The sentence suffers stylistically for several reasons—and the second article shouldn't be there at all.
Any of the following would be more natural:
The more one's effort is sincere, the more one's growth is fast.
The more one's effort is sincere, the faster is one's growth.
The more sincere is one's effort, the faster is one's growth.
It depends on whether this source is using the strict dictionary definition of "quantitative", or some field-specific usage with a nuanced meaning
quantitative (adj): relating to an amount that can be measured
This is a binary, yes/no condition. Something either is quantitative or is not quantitative, with no need for comparative or superlative.
I have added some brackets to show how to group the words:
(My (previous (good computer))) cost me $500.
In the past I owned a good computer, and it cost $500. The adjective "previous" modifies "good computer".
(My ((previously good) computer)) cost me $500.
In an unspecified time (but probably the present), I own or owned a computer which cost $500....
"My previous good computer [...]" means "the good computer I owned before my current good computer".
"My previously good computer [...]" means "my computer which used to be good but is no longer so".
I hope this helps.
I gather you're extrapolating from the use of "dead" as an intensifier in other expressions such as "dead certain" or "dead on" (as well as "dead right", "dead on time", etc.) where "dead" means "absolutely" or "perfectly". In English as in any language, you can apply the idiomatic use to a new context, but you may confuse your audience.
I would ...
I would use with caution. Its not really proper English but is used quite commonly among the less well spoken population.
It is becoming more common, but (in my opinion) should not used as an adverb at all.
I'm not sure why you couldn't find it on google. I tried "dead as an adverb" and there were plenty of results. E.g. Oxford Learners Dictionary
An adverb usually follows the verb, but can precede it, possibly giving emphasis to it. Google Ngram Viewer shows that 'he carefully thought' is about half as common as 'he thought carefully'. 'You' and 'they' are similar, but 'she carefully thought' is only about one-tenth as common as 'she thought carefully' and there is no record of 'we carefully thought' ...
You can call it an artificial island:
Osaka airport was built on an artificial island in the bay, as there was no more space in the city.
When land is reclaimed from side of a river, it is called an embankment.
Cleopatra's needle was installed in London on the embankment of the Thames.
A large flat area reclaimed from the sea and protected by dykes, ...