Advertent is a word that describes someone who is attentive or conscious of their actions. So, its antonyms would be words that describe the opposite of such a person. Inattentive, oblivious, absent-minded, negligent, and unmindful are some of the antonyms discussed. These words signify a lack of awareness or concern with one's surroundings or actions. When someone is inattentive, they are not paying attention, and when they are oblivious, they are unaware of their surroundings. Being absent-minded means that someone is forgetful, and if they are negligent, they disregard the safety or the importance of their actions. Finally, being unmindful is not paying attention and being indifferent to their impact. All of these antonyms represent disregarding the importance of paying attention to one's actions.