Definition of "thorough" in English

adjective

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.
   • Not enough! Your work has to be thorougher than this.
   • It's the most thorough artwork I have ever seen!
   • The infested house needs a thorough cleansing before being inhabitable again.

2. Utter; complete; absolute.

preposition

1. (archaic) Through.

noun

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