The word "more improficient" is itself a comparative form of the adjective "improficient". It means not skilled or not competent in performing a particular task. Some antonyms for "more improficient" may include "proficient", "adept", "skilled", "competent", "expert", "talented", "capable", "efficient", "effective", and "masterful". These words denote a level of proficiency or skill that is above average, indicating a high degree of experience, knowledge, or expertise in a particular field. Using antonyms for "more improficient" can help to emphasize the positive aspects of someone's ability or achievement, rather than simply highlighting their weaknesses.