The word "unheavier" implies that something is becoming less heavy or lighter. Its antonyms, on the other hand, will refer to an increase in weight or heaviness. Such antonyms include "heavier," "weightier," "bulkier," "massive," "substantial" and "ponderous." These words denote the opposite of "unheavier" and signify an increase in the size or mass of an object. For example, if you start with an empty backpack, it becomes "unheavier" (lighter) as you remove items from it. On the other hand, it becomes "heavier" when you add more items to it. Therefore, the use of antonyms is essential in understanding the meaning of various words and conveying the correct message in spoken and written communication.
