The term "jerky respiration" refers to an irregular or spasmodic pattern of breathing that can be indicative of various health problems, including anxiety, asthma, or certain neurological conditions. Antonyms, or opposite words, for this term would include smooth, rhythmic, or even, reflecting a regular and effortless flow of air in and out of the lungs. Other related terms could include steady, constant, deep, or controlled respiration, all of which suggest a state of calm and relaxation. Practicing deep breathing exercises, such as yoga or meditation, can help individuals achieve a more consistent and comfortable breathing pattern.