thorough vs thoroughly

thorough is an adjective but thoroughly is not an adjective.

Word	Noun	Adjective	Verb	Adverb
thorough	No	Yes	No	No
thoroughly	No	No	No	Yes

thorough (adjective)	thoroughly (adjective)
painstakingly careful and accurate
performed comprehensively and completely; not superficial or partial
without qualification; used informally as (often pejorative) intensifiers

thorough (adverb)	thoroughly (adverb)
	in an exhaustive manner
	completely and absolutely (`good' is sometimes used informally for `thoroughly')