The opposite of being more advertent is being less advertent, which means you're not as focused or attentive as you should be. Some other antonyms for more advertent might include careless, inattentive, negligent, unconcerned, and absent-minded. If you are not paying attention, you might miss important information or even make mistakes that could have been avoided. Being less advertent can be a result of a lack of interest or motivation, being distracted, or simply not putting in enough effort. Whatever the reason, it's important to recognize the importance of being attentive and focusing on the task at hand.