Sucker punches are defined as an unexpected blow or attack, often carried out by surprise. There are plenty of synonyms for sucker punches that can help you describe the experience of being blindsided, ambushed, or caught off guard. These include terms such as blindsided, hit below the belt, cheap shot, knock-out punch, abrupt attack, surprise blow, and sneak attack. Depending on the context, other phrases that can be used to describe the same thing might include betrayals, deceits, or insidious acts of violence. Whatever term you choose to use, the sensation of being sucker punched is always a difficult one to shake.