On Impulse is defined as impulsive behavior or actions which are taken without any prior planning or consideration. Synonyms for On Impulse include impulsively, hastily, spontaneously, suddenly, thoughtlessly, recklessly, carelessly, rashly, swiftly, and without forethought. When we act on impulse, there is no deliberation or thinking about the consequences of our actions beforehand. It is important to weigh the pros and cons of a situation before making a hasty decision. Thus, it is wise to think before we act and avoid making any decisions in haste. Conclusively, it is essential to consider all the possible outcomes of a situation before acting impulsively on it.