thor·​ough·​ly | \ ˈthər-(ˌ)ō-lē, sometimes ˈthȯr-; ˈthə-(ˌ)rō-\

Definition of thoroughly 

: in a complete or thorough manner Police thoroughly searched the crime scene for clues. Bats are extremely tidy: they comb themselves thoroughly, and don't gather a mess of nesting materials for their homes, as birds do.— Diane Ackerman : to a complete or thorough extent We were thoroughly satisfied with the service we received. thoroughly disgusted/delighted By taking all the tricks in the game, one defeats the opponent so thoroughly that he may be disconcerted …— Craig M. Carver

First Known Use of thoroughly

15th century, in the meaning defined above

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The first known use of thoroughly was in the 15th century

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involving abstract or general statements

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