The term "cooling-off period" is often associated with a time frame during which one can reconsider and retract from a decision without any consequences. Antonyms for the phrase would be "heated impulsive action," suggesting rash decisions and actions without proper consideration. "Rash impulsivity" could also be used to describe someone who acted impulsively without giving proper thought to their actions. Other antonyms could be "hasty reflexes," "rushed decisions," or "rash responses." These terms all suggest the opposite of the calm and thoughtful approach that a cooling-off period is meant to bring, emphasizing a hurried and impetuous attitude.