Headfirst is an expression that indicates diving or falling with one's head leading the way. There are several synonyms for this word, including headlong, recklessly, impetuously, rashly, carelessly, and impulsively. All of these synonyms indicate a certain level of risk-taking behavior, where the individual is not engaging in a cautious or measured approach. Headlong suggests a sense of urgency or haste, while recklessly implies a lack of consideration for the consequences of one's actions. Impetuously and rashly both indicate a sudden decision or action without careful consideration, while carelessly and impulsively imply a disregard for safety or potential dangers.