'The' is an adjective, in fact it is a particular type of adjective known as an article, and it is a 'definite article' at that.
The word "as" can be used as an adverb.
It is an adjective. Selfishly is an adverb.
The word straight is an adverb, an adjective, and a noun.The word home is an adverb, an adjective, and a noun.The word usually is an adverb and an adjective.The word hard is an adverb and an adjective.
No, the word "light" can be used as an adjective or a noun. "lightly" can be used as an adverb.
The word daily can be used either as an adjective or as an adverb.
The word lonely is an adjective. There is a seldom-used adverb form (lonelily).
Yes. Underwater can be used as an adjective and an adverb. adjective: underwater expedition adverb: swim underwater
The word alone is used as both an adjective or adverb.*The adverb form of the adjective "lonely" form is practically never used, but is lonelily.
The word tropical is an adjective form of the word tropic or tropics. The word tropic is also used as an adjective. The adverb form is "tropically."
The word muddy is an adjective. The adverb form (muddily) is very rarely used.
Last can be used as both. arrived last (adverb) last word (adjective)
No, it is not an adverb. Useful is an adjective and the adverb form is usefully.