Princeton's WordNet

1. thoroughly, exhaustively(adverb)

   in an exhaustive manner

   "we searched the files thoroughly"

2. thoroughly, soundly, good(adverb)

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

   "he was soundly defeated"; "we beat him good"

Wiktionary

1. thoroughly(Adverb)

   In a thorough or complete manner.

   He went out in the rain and came back thoroughly drenched.

Webster Dictionary

1. Thoroughly(adverb)

   in a thorough manner; fully; entirely; completely

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