adverb (r)

• to a great extent or degree(adv.all)

  Example:
  Painting the room white made it seem considerably (or substantially) larger.
  The price went up substantially.
  

  Synonym:
  considerably, well
  

  source: wordnet30
• in a strong substantial way(adv.all)

  Example:
  The house was substantially built.
  

  source: wordnet30
• In a substantial manner; in substance; essentially.(adverb)

  source: webster1913