Adverbial substantially has 2 senses
  1. well, considerably, substantially - to a great extent or degree; "I'm afraid the film was well over budget"; "painting the room white made it seem considerably (or substantially) larger"; "the house has fallen considerably in value"; "the price went up substantially"
    Derived from adjective substantial1
  2. substantially - in a strong substantial way; "the house was substantially built"
    Derived from adjective