adverb (r)

• to double the degree(adv.all)

  Example:
  She was doubly rewarded.
  

  Synonym:
  double, twice
  

  source: wordnet30
• in a twofold manner(adv.all)

  Example:
  He was doubly wrong.
  

  source: wordnet30
• In twice the quantity; to twice the degree; as, doubly wise or good; to be doubly sensible of an obligation.(adverb)

  source: webster1913