The word "most sardined" refers to a situation where people or things are packed tightly together like sardines in a can. Its antonym, therefore, refers to the opposite - where people or things are not crowded or crammed together but have ample space to move around freely. This antonym can be expressed with words such as spacious, roomy, open, uncrowded, uncluttered, or airy. When describing a space, such as a room or building, these words suggest that there are few or no obstacles to movement or that the layout encourages a sense of freedom and relaxation. In general, the antonym for "most sardined" implies a feeling of ease, comfort, and tranquillity.