Temeritous is an adjective that means reckless or rash. It can be used to describe someone who acts impulsively and without regard for the consequences. Synonyms for temeritous include audacious, foolhardy, brash, impulsive, hasty, and daredevil. These words all convey a sense of recklessness or disregard for danger. Other words that may be used as synonyms for temeritous include adventurous, daring, adventurous, wild, and bold. Each of these words has a slightly different connotation, but they all share the sense of someone who is willing to take risks and act boldly, even when the outcome is uncertain.