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Etymology 1[edit]

From Old English þuruh.

Alternative forms[edit]


thorough ‎(comparative more thorough, superlative most thorough)

  1. painstaking and careful not to miss or omit any detail
    The Prime Minister announced a thorough investigation into the death of a father of two in police custody.
    He is the most thorough worker I have ever seen.
    The infested house needs a thorough cleansing before it will be inhabitable.
  2. utter; complete; absolute
    It is a thorough pleasure to see him beg for mercy.
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Derived terms[edit]

Etymology 2[edit]

A disyllabic form of Old English þurh ‎(through).



  1. (obsolete) Through. [9th-19th c.]


thorough ‎(plural thoroughs)

  1. (Britain, dialect) A furrow between two ridges, to drain off the surface water.
    (Can we find and add a quotation of Halliwell to this entry?)