[thur-oh, thuhr-oh]
See more synonyms for thorough on
  1. executed without negligence or omissions: a thorough search.
  2. complete; perfect; utter: thorough enjoyment.
  3. extremely attentive to accuracy and detail; painstaking: a thorough worker; a thorough analysis.
  4. having full command or mastery of an art, talent, etc.: a thorough actress.
  5. extending or passing through.
adverb, preposition
  1. Archaic. through.
  1. (initial capital letter) English History. the administrative policies of the Earl of Stafford and Archbishop Laud during the reign of Charles I: so called because they were uncompromisingly carried out.

Origin of thorough

before 900; Middle English (preposition and adv.); Old English thuruh, variant of thurh through
Related formsthor·ough·ly, adverbthor·ough·ness, nounqua·si-thor·ough, adjectivequa·si-thor·ough·ly, adverbsu·per·thor·ough, adjectivesu·per·thor·ough·ly, adverbsu·per·thor·ough·ness, nounun·thor·ough, adjectiveun·thor·ough·ly, adverbun·thor·ough·ness, noun

Synonyms for thorough

See more synonyms for on

Antonyms for thorough Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for unthorough

Historical Examples of unthorough

  • The word “amateur” must not be taken here in the sense of superficial or unthorough.

    William Oughtred

    Florian Cajori

British Dictionary definitions for unthorough


  1. carried out completely and carefullya thorough search
  2. (prenominal) uttera thorough bore
  3. painstakingly carefulmy work is thorough
Derived Formsthoroughly, adverbthoroughness, noun

Word Origin for thorough

Old English thurh; related to Old Frisian thruch, Old Saxon thuru, Old High German duruh; see through


  1. thoroughgoing policy, as adopted in England by Strafford and Laud during the reign of Charles I
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for unthorough



late 15c., 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 (c.1300).

Online Etymology Dictionary, © 2010 Douglas Harper