Antonyms are words that have opposite meanings to the original word. Therefore, antonyms for posterior circulation brain infarction would include terms that are not related to this medical condition. Some possible antonyms could be words like health, wellness, vitality, and fitness. These words represent the opposite of the negative effects caused by a posterior circulation brain infarction, such as reduced blood flow to vital areas of the brain. Other antonyms could include words like strength, power, and energy, as these words evoke the opposite image of weakness and debilitation associated with brain infarction. By using antonyms effectively, we can help to create a contrast between negative and positive concepts, and help to highlight the importance of good health and well-being.