The antonyms for the word "are cautious" would be fearless, rash, reckless, impulsive, and daring. Fearless means having no fear or being boldly courageous. Rash implies acting without careful consideration or deliberation, and recklessness denotes a disregard for danger or negative consequences. Impulsive means acting on sudden urges or emotions without thought or planning. Daring suggests courage, boldness, and a willingness to take risks. All of these words indicate a lack of caution, which can sometimes be necessary but can also lead to negative consequences.