Etymology
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thorough (adj.)

c. 1300, adjectival use of Old English þuruh (adv.) "from end to end, from side to side," stressed variant of þurh (adv., prep.); see through. Related: thoroughly; thoroughness.

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Definitions of thorough

thorough (adj.)
without qualification; used informally as (often pejorative) intensifiers;
a thorough nuisance
Synonyms: arrant / complete / consummate / double-dyed / everlasting / gross / perfect / pure / sodding / stark / staring / thoroughgoing / utter / unadulterated
thorough (adj.)
painstakingly careful and accurate;
thorough research
our accountant is thorough
thorough (adj.)
performed comprehensively and completely; not superficial or partial;
made a thorough search
From wordnet.princeton.edu