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adjective
evasive - To avoid giving clear direct answers to questions.
noun
rogue - Behaving in a way that causes damage.
verb
gouge - Overcharge; swindle (related to other meaning: to take out flesh)
nounverb noun
fib - A lie, typically an unimportant one
scam - A dishonest scheme; a fraud
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underhanded - Dishonest or sneaky, often done in a secret or deceitful way.
sham - A thing that is not what it is purported to be
Infiltrate - To secretly enter a place, organization, or group, often for spying or sabotage.
cunning - Skill in achieving one's ends by deceit
unscrupulous - Behaving in a way that is dishonest or unfair in order to get what you want
hoax - A humorous or malicious deception
tamper - Interfere with (something) in order to cause damage or make unauthorized alterations