Jouncier refers to a bouncy or jumpy quality, and some antonyms for this word can include steady, smooth, and calm. If something is steady, it is consistent and stable, without any abrupt or jerky movements that might characterize a jouncy object or surface. Smooth, on the other hand, suggests fluidity and ease, without any sudden bumps or shifts that might disrupt the flow. Calm can be an antonym for jouncier when it refers to a sense of tranquility and relaxation, as opposed to the frantic, jittery energy that might characterize a jouncy or jumpy situation. Other antonyms for jouncier might include still, placid, or static, depending on the context in which the word is being used.