The word "un-retentive" means lacking the ability to remember or retain information. Some antonyms for this term include "memorizing," "store," "learn," "absorb," "comprehend," "retain," and "recalling." These antonyms indicate the opposite of "un-retentive," implying that an individual possesses a strong ability to learn, remember, and recall information. Such qualities are beneficial in academic settings and professional environments where knowledge retention and application are essential. Hence, if someone is considered un-retentive, they may improve their recall abilities by adopting methods that help them learn and retain information quickly and effectively.