fraudulent (adj.)

• artful
• bent
• burglarious
• calculating
• collusive
• conscienceless
• corrupt
• corrupted
• counterfeit
• crafty
• criminal
• crooked
• cunning
• dark
• deceitful
• deceptive
• devious
• dishonest
• dishonorable
• double-dealing
• doubtful
• dubious
• duplicitous
• evasive
• fake
• false
• felonious
• fishy
• forged
• furtive
• guileful
• ill-gotten
• imitation
• immoral
• indirect
• insidious
• light-fingered
• pinchbeck
• questionable
• rotten
• scheming
• shady
• sham
• shameless
• sharp
• shifty
• sinister
• slippery
• sneaky
• spurious
• surreptitious
• suspicious
• thieving
• thievish
• treacherous
• tricky
• two-faced
• unconscientious
• unconscionable
• underhand
• underhanded
• unethical
• unprincipled
• unsavory
• unscrupulous
• wily