The term "poshnesses" denotes a high level of elegance, luxury, and refinement. Antonyms for this word could be simple, plain, modest, humble, or even shabby. These words suggest a lack of extravagance or excess and can be used when referring to a more down-to-earth lifestyle or surroundings. Additionally, the terms rustic, unpretentious, or unassuming could be used to describe a relaxed and casual environment that is free from unnecessary fussiness or pretension. By using antonyms for "poshnesses," we can paint a picture of a different kind of atmosphere and lifestyle, one that prioritizes simplicity and modesty over grandeur and lavishness.