Bulgarian-English translations for основателно

• fair
  Mondays child is fair of face
  There was once a knight who wooed a fair young maid
  ones fair name
• reasonable
  a reasonable demand, amount, or price
  $20 a bottle is very reasonable for a good wine at a restaurant.
  Say, would you happen to know a good place for lunch in the downtown area? ... The Radisson ... Oh yah? ... Is it reasonable? - Marge Gunderson in Fargo (1996
• valid
  I will believe him as soon as he offers a valid answer.
  A valid format for the date is MM/DD/YY.
  Do not drive without a valid license.