unconscientious (adj.)

• conscienceless
• corrupt
• corrupted
• criminal
• crooked
• dark
• devious
• dishonest
• dishonorable
• doubtful
• dubious
• evasive
• felonious
• fishy
• fraudulent
• ill-gotten
• immoral
• inaccurate
• indirect
• inexact
• insidious
• questionable
• rotten
• shady
• shameless
• shifty
• sinister
• slippery
• suspicious
• tricky
• unconscionable
• uncritical
• underhand
• underhanded
• unethical
• unexacting
• unprincipled
• unpunctual
• unsavory
• unscrupulous