The word "more overstuffed" refers to something that is excessively packed, crowded or filled beyond its capacity. In contrast to this, the antonyms for "more overstuffed" would be words that suggest emptiness, sparseness, or minimalism. These could include words like empty, bare, unadorned, airy, light, sparse, or uncluttered. Such words connote a sense of simplicity, ease, and unburdenedness, which stand in direct contrast to the connotations of "more overstuffed." By using these antonyms, we can create a sense of balance and harmony in our language, and convey a more nuanced and precise meaning to our words.