The adverb form is feebly.
He tried feebly to open the door.
Adjectives that end in -LE drop the E and add Y instead of adding -LY as other adjectives do. (nimble -> nimbly, simple -> simply, humble -> humbly)
"Happily" is the adverb. As with several other words, you change the final "y" of the basic word to "i" before adding the suffix.
The adverb of funny is funnily or funny.
feeble, weak, puny, infirm, flimsy, delicated, vulnerable, insubstantial
peacefully
Adding "ly" is the most common way to change an adjective like "merry" into an adverb. So, that would give "merryly". However, in this case we change the "y" into "i" as well. So, that gives "merrily" as the adverb.
Yes, you can change patience into an adverb. The adverb is "patiently."
"Happily" is the adverb. As with several other words, you change the final "y" of the basic word to "i" before adding the suffix.
feeble shock
The adverb of funny is funnily or funny.
Gwan (weak, feeble)eiddil (feeble, slender)
He presented a feeble argument in defence of his views. She gave a feeble excuse for missing her appointment. Influenza has left him very feeble. The pre-dawn light was very feeble. Her voice was so feeble it was difficult to hear.
feeble, weak, puny, infirm, flimsy, delicated, vulnerable, insubstantial
To change "sizzle" into an adverb, you can use "sizzlingly." For example, "The bacon sizzled sizzlingly in the pan."
The word "feeble" is an adjective.
The homonym of feeble is fable.
The Feeble Files happened in 1997.
The Feeble Files was created in 1997.