adverb (r)

• to an exceedingly great extent or degree

  kepada yang amat besar sejauh atau derajat

  Example:
  He had vastly overestimated his resources.
  

  Synonym:
  immensely
  

  source: wordnet30
• To a vast extent or degree; very greatly; immensely.

  dengan keluasan ladang atau derajat; sangat sangat; luar biasa.

  source: webster1913