Thorough Definition

thûrō, thŭrō
adjective
Exhaustively complete.
A thorough search.
American Heritage
Passing through.
Thoroughfare.
Webster's New World
Done or proceeding through to the end; omitting nothing; complete.
A thorough checkup.
Webster's New World
Very exact, accurate, or painstaking, esp. with regard to details.
A thorough researcher.
Webster's New World
That is completely (the thing specified); out-and-out; absolute.
A thorough rascal.
Webster's New World
preposition
Webster's New World

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

Wiktionary
noun
The ruthlessly thoroughgoing administrative policies carried out by William Laud and the Earl of Strafford during the reign of Charles I.
Webster's New World

(UK, dialect) A furrow between two ridges, to drain off the surface water.

Wiktionary

Other Word Forms of Thorough

Noun

Singular:
thorough
Plural:
thoroughs

Origin of Thorough

  • Middle English thorow through, thorough from Old English thuruh from end to end, through terə-2 in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • A disyllabic form of Old English þurh (“through").

    From Wiktionary

  • Old English þuruh.

    From Wiktionary

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