thorough

/ˈθɜroʊ/
adjective
  1. Complete and including every detail; done with great care and attention.
    • The mechanic did a thorough inspection of the car before we bought it.
    • A thorough cleaning of the kitchen took the whole afternoon.
    • She wrote a thorough report on the history of the town.
  2. Very careful and paying attention to every small part of a task.
    • The teacher praised the student for being thorough in her math homework.
    • Being thorough when you pack for a trip helps you avoid forgetting things.
    • He is a thorough researcher who checks every fact twice.
  3. Complete in a negative sense; absolute or utter.
    • The movie was a thorough waste of time.
    • The party was a thorough disaster from start to finish.
    • I made a thorough mess of the kitchen while baking cookies.
preposition
  1. An old-fashioned or literary way of saying 'through'.
    • The knight rode thorough the forest without fear.
    • The river flows thorough the valley.
    • We walked thorough the gate into the garden.