One is "never," and another is "immediately and another is "on a dime."
opposite is an adjective
gently
"Often" and "frequently" are antonyms of "rarely".
'Generous' is an adjective and the opposite is 'miserly', which is also an adjective even though it ends in 'ly like many adverbs.
The noun 'opposite' is a singular, common, abstract noun; a word for a person or thing that is totally different from or the reverse of someone or something else; a word for 'antonym'; a word for a concept; a word for a thing.The word 'opposite' is also an adjective, an adverb, and a preposition.
opposite is an adjective
The opposite of the adverb bitterly is sweetly.The word sweetly is also an adverb.
The word "eventually" is an adverb.
The opposite of the adverb firmly (securely) is loosely.*When used to mean forcefully or determinedly (e.g. firmly stated), the opposite could be gently, weakly, or waveringly.
The adverb "well" is the usual opposite of the adverb "badly." If "badly" is used to mean "extremely or greatly" the opposite could be "slightly." E.g. He was badly bruised./He was slightly bruised.
No. Eventually is an adverb. It cannot act as a preposition.
No, it is an adjective, the opposite of definite. The adverb form is indefinitely.
The adverb is eventually, because it modifies the verb arrived.
gently
Careful.
Roughly
No, eventually is an adverb. Eventual is the adjective form.