thoroughly vs soundly

thoroughly and soundly both are adverbs.

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

As adverbs, thoroughly and soundly are synonyms defined as:

thoroughly and soundly: completely and absolutely (`good' is sometimes used informally for `thoroughly')

Other synonyms of thoroughly include good.

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