The antonyms for the word "more featherweight" can be "heavier," "heftier," or "bulkier." The term "featherweight" refers to something that is exceptionally light or delicate. Antonyms, on the other hand, describe words that hold opposite meanings. Therefore, "more featherweight" means even lighter than its original meaning. For instance, a feather may be lighter than a coin, but a feather plucked from a bird could be heavier than the feather used as an analogy. Regardless, the antonyms for "more featherweight" portray a sense of weight and massiveness, opposite to the original word's perception.