It can be. Less can be a noun (a lesser amount), an adjective, a preposition (without), or an adverb (the comparative form of little).
Examples:
"We know less about the new species than the others."
"I work less during winter."
No, it is a conjunction, or less defintively a preposition. The similar word "then" can be an adverb.
It can be, as in "he ran ahead" (ran where). It is less clearly an adverb in uses such as "he was ahead in the race" or "the path ahead is clear."
Does is a verb, not an adverb.
Adverb
adverb
No. In the pair, likely is an adjective, and less is an adverb. Likely by itself can be an adverb, as in they'll likely fail.
It is an adjective. The less-used adverb form is dizzily.
No, it is a conjunction, or less defintively a preposition. The similar word "then" can be an adverb.
It is widely used as an adverb. It can also be a conjunction, meaning "after." It is less clearly an adjective.
No, it is an adverb of time. It refers to a frequency (less than often), or not usually.
The word less is an adjective. It can also be an adverb and a verb.
Little is usually an adjective, but it may be used as an adverb: He speaks little and knows less.
No, "little" is typically used as an adjective to describe the size or quantity of something, not as an adverb.
"About" can function as a preposition when it is used to indicate a topic or subject. For example, "We're talking about grammar." It can also be an adverb when used to convey approximation, as in "It's about 5 kilometers away."
The noun addiction has the adjective form additional and the adverb form additionally (in addition).The less-common related adjective and adverb are the derivatives additive and additively.
Foolishly is an adverb, yes.Some example sentences are:Foolishly, I rejected the offer.He foolishly sold the antique for less than its value.
It can be, as in "he ran ahead" (ran where). It is less clearly an adverb in uses such as "he was ahead in the race" or "the path ahead is clear."