DECEITFULLY
dishonestly, venally, deceitfully
(adverb) in a corrupt and deceitful manner; “he acted dishonestly when he gave the contract to his best friend”
Source: WordNet® 3.1
Etymology
Adverb
deceitfully (comparative more deceitfully, superlative most deceitfully)
in a deceitful manner
with the intention to deceive
Source: Wiktionary
De*ceit"ful*ly, adv.
Definition: With intent to deceive.
DECEITFUL
De*ceit"ful, a.
Definition: Full of, or characterized by, deceit; serving to mislead or
insnare; trickish; fraudulent; cheating; insincere.
Harboring foul deceitful thoughts. Shak.
Source: Webster’s Unabridged Dictionary 1913 Edition