Webster's Revised Unabridged Dictionary · 1913

Thorough

Thorough , preposition

[See Through.]

Through. [Obsolete] — Spenser. Shak

Thorough , adjective

1.
Passing through; as, thorough lights in a house. [Obsolete]
2.
Passing through or to the end; hence, complete; perfect; as, a thorough reformation; thorough work; a thorough translator; a thorough poet.

Thorough , adverb

1.
Thoroughly. [Obsolete or Colloquial] — Chaucer
2.
Through. [Obsolete] — Shakespeare

Thorough , noun

A furrow between two ridges, to drain off the surface water. [Provincial English] — Halliwell