Faithfully is an adverb and does not have a plural form. There cannot be more than one faithfully.
The plural of monastery is monasteries.
The plural of Muslim is Muslims.
The plural form of sacrifice is sacrifices.
The plural form for parish is parishes; the plural possessive form is parishes'.
The plural of Sunday is Sundays.
Comparative: more faithfully Superlative: most faithfully
Singular.The current presidential administration is not living up to expectations.There are many administrations in history that have faithfully served the people.
Yours Faithfully
The servant stayed faithfully by his master, no matter the problem. The novel was translated as faithfully as possible.
I am faithfully yours.
faithfully
Comparative - more reliable Superlative - most reliable.
Dependably and reliably are synonyms for faithfully.
My sister Faithfully prayed to god
I have faithfully served the Lord with all my heart.
It can be... as in the sentence "She followed him faithfully."; in which case she is the subject, followed is an action verb, him is the direct object, and faithfully is an abverb modifying the verb followed.
The correct spelling is "faithfully" (in a loyal manner).