1) By deceit 2) Craftily 3) Cunningly 4) Deceitfully 5) Deceivingly 6) Deceptively 7) Deviously 8) Disingenuously 9) Disloyally 10) Faithlessly 11) Fraudulently 12) Hypocritically 13) Immorally 14) In an underhanded way 15) Misleadingly 16) Ruthlessly 17) Treacherously 18) Unfaithfully 19) Unrepresentatively 1) Corruptly 2) Deceitfully 3) Falsely 4) Illegally 5) Unlawfully 6) Untruthfully 7) Venally 
• (adv.) In a dishonest manner.
Dis·hon'est·ly adverb In a dishonest manner. 
[adv] - in a corrupt and deceitful manner
venally adverb in a corrupt and deceitful manner; `he acted dishonestly when he gave the contract to his best friend`