The adverb is the rarely-seen lengthily. Normally this meaning is expressed by the adverbial phrase "at length." The adverb long can also be used (e.g. a change long anticipated).
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No, "lengthy" is an adjective, used to describe something that is long or extended in duration.
No, "stick" is not an adverb. It is a noun or a verb. An adverb is a word that describes or modifies a verb, adjective, or another adverb.
The adverb of "sly" is "slyly."
The adverb form of possess is possessively.
The adverb of shy is shyly.