'Sleet' is a noun and its related adjective is 'sleety'. You could argue that there is therefore an adverb 'sleetily', but in what context would you need to use it, and what would it mean?
i hate the sleet!
I hope it does not sleet tonight! I don't like to drive in the sleet.
sleet/slēt/Noun:Rain containing some ice, as when snow melts as it falls.Verb:Sleet falls.The sleet fell heavily to the ground, causing it to be slippery.orThe sleet was so thick, you could hardly see out your window.orHighway 43 was closed because of poor conditions from the sleet.
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
In the English language, "fire" has no adverb form.