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.
No, it is not an adverb. Doorway is a noun.
Behaved is not an adverb, no.The word behaved is in fact a verb.
No, inquisitive is an adjective. The adverb would be inquisitively.
No. Shaky is an adjective. The adverb form is "shakily."
Various is an adjective. Variously is an adverb.
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, the word office is not an adverb at all.The word office is in fact a noun.
No, century is not an adverb.Century is in fact a noun.
Verb ; Import Adverb ; Importantly Noun ; Importance Adjective ; Important