dishonest

/dɪsˈɑnɪst/
adjective
  1. Not truthful or fair; tending to lie, cheat, or deceive.
    • She felt dishonest when she pretended to enjoy the boring movie.
    • It is dishonest to copy someone else's homework and claim it as your own.
    • The dishonest salesman lied about the car's condition.