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Synonyms
thor·ough (thûŕō, thŭŕō)

[Middle English thorow, through, thorough, from Old English thuruh, from end to end, through.]

adjective 

  1. Exhaustively complete: a thorough search.
  2. Painstakingly accurate or careful: thorough research.
  3. Absolute; utter: a thorough pleasure.

prep. adverb 

Archaic
Variant of through

derivatives

thoŕough·ly
adverb
thoŕough·ness
noun