Incommensurate is an antonym for the word "in commodious". It means inadequate, insufficient, or not appropriate for the purpose. Disproportionate is another antonym that refers to something that is not in balance or lacks symmetry. Other antonyms for "in commodious" include cramped, restricted, and confined. All these words imply the opposite of spaciousness or roominess, making them useful for describing environments, living spaces, or physical structures that are uncomfortable or inconvenient. By using antonyms like incommensurate or disproportionate, one can emphasize the undesirable qualities of a location or environment while highlighting the need for improvement or change.