the noun fact has the adjective form factual. The adverb of that form is factually.
No, it is not an adverb. Ancient is an adjective.
No. Easier is an adjective. The adverb form is easily.
Behaved is not an adverb, no.The word behaved is in fact a verb.
No, it is not an adverb. Doorway is a noun.
No, inquisitive is an adjective. The adverb would be inquisitively.
Various is an adjective. Variously is an adverb.
No. Shaky is an adjective. The adverb form is "shakily."
No, it is not an adverb, but an adjective (sad, sorrowful, unfortunate). The adverb form is tragically.
No, the word "service" is not an adverb.The word "service" is in fact a noun, an adjective and a verb, but not an adverb.
No, century is not an adverb.Century is in fact a noun.
No, the word office is not an adverb at all.The word office is in fact a noun.
Verb ; Import Adverb ; Importantly Noun ; Importance Adjective ; Important