"In commodiousnesses" refers to a lack of spaciousness, comfort, or convenience. The antonyms for this term would therefore include adjectives such as roomy, comfortable, capacious, or convenient. Other possible antonyms include terms such as ample, spacious, vast, or breezy, which all imply a sense of openness, ease of movement, or simply more room to stretch out and relax. By using these antonyms, we can describe more positive and welcoming spaces that are more conducive to our well-being, productivity, and overall enjoyment of life.