adverb (r)

• in a corrupt and deceitful manner(adv.all)

  Example:
  He acted dishonestly when he gave the contract to his best friend.
  

  Synonym:
  deceitfully, venally
  Antonym:
  aboveboard, honestly
  

  source: wordnet30
• In a dishonest manner.(adverb)

  source: webster1913