Most Straight Arrow is a term that is often used to describe someone who is principled, honest, and moral. However, there are several antonyms for this term that represent the opposite characteristics such as deceitful, cunning, and unscrupulous. These individuals lack integrity, honesty, and ethical values, which makes them untrustworthy and unreliable. They often manipulate others for their own personal gain and have no qualms about lying or cheating to achieve their goals. Moreover, the antonyms for Most Straight Arrow can be used to describe individuals who lack transparency and accountability, and who engage in shady and unethical practices to climb the ladder of success.