Every supervillain is known for their improbity: dishonesty, immorality, and shadiness. Improbity is a heavy-duty word for a general lack of integrity.
A corrupt executive or politician displays improbity by doing things like fraudulently using company or public funds for personal gain. Improbity encompasses any immoral or unethical behavior. Its roots are im-, meaning "not," and the Latin probitas, meaning "honesty" or "uprightness." So while someone with probity is an upstanding person of their word, someone characterized by improbity cannot be trusted.