The preposition "on" is an adverb when it has no object noun.
Examples are "we cannot go on" or "they sailed on." (synonymous with onward)
*Note:
Some preposition forms are stated out of order: "We have nothing to base this on."
Some forms (put your raincoat on) seem to be adjectives instead, where the word on means being worn. This is analogous to "on" meaning in operation (turn the radio on).
Yes, thankfully we can use it as an adverb. It is the adverb form of the adjective thankful.
You would have to use one of the adverb forms "thoughtfully" or "thoughtlessly."
Formulaically is the adverb form of formula.
the adverb for curious is seriously because when you use that in curious it suits very much...
The adverb form of by means close by, or passing by, as in: "Let's run by." "The birds flew by"
Adverb
Yes, thankfully we can use it as an adverb. It is the adverb form of the adjective thankful.
You would have to use one of the adverb forms "thoughtfully" or "thoughtlessly."
(You would have to use the adverb, which is tenderly.) She touched his face tenderly.
Formulaically is the adverb form of formula.
As an adverb .
no
Like this: I did my history homework yesterday. That's how you use yesterday as an adverb in a sentence
The adverb would be "inalienably." But it would have very limited use.
Adverb: I had a hat on. Preposition: I didn't have any money on me.
In the English language, "fire" has no adverb form.
As your question indicates, "entirely" is an adverb; it doesn't need an additional suffix.