1. extremely wicked, evil, or morally reprehensible

Examples

• The dictator was responsible for heinous crimes against humanity.
• She couldn’t forgive him for his heinous betrayal of their friendship.
• The jury was shocked by the heinous nature of the defendant’s actions.
• Many consider genocide to be among the most heinous acts possible.
• The newspaper described the attack as a heinous act of terrorism.
• His heinous behavior toward the elderly residents led to his dismissal.