Up-right is a term used to describe something that is standing straight and tall, with an upward orientation. Some antonyms for up-right could include words that describe something that is slanted, tilted or leaning. These might include words like slouching, leaning, or tilted. Another set of antonyms that describe the opposite of up-right could include words like hunched, crouched, or stooped. These words describe a posture that is bent or curved forward, with a downwards orientation instead of an upright or vertical one. Overall, there are many different antonyms for up-right, each of which describes a different posture or orientation.