The term "more unretentive" refers to a lack of ability to retain information or memories. Some antonyms that could be used to describe the opposite of this term might include "retentive," "remembering," "memorable," "knowledgeable," "mindful," "sharp," and "cognizant." These words denote a person's ability to remember and retain information, either through strong memory or diligent study. Someone who is retentive can easily store and recall facts and details, while someone who is unretentive may struggle with forgetfulness, lapses in memory, and difficulty retaining new information. By using antonyms to describe the opposite of "more unretentive," we can gain a better understanding of how to improve our memory and cognitive abilities.