1. He was known among his friends as a melancholiac, always seeing the dark side of things.
在他的朋友圈里，他被誉为一个悲观主义者，总是看到事情的阴暗面。
2. The psychologist diagnosed him as a melancholiac and prescribed medication for his depression.
心理学家诊断他患有忧郁症，并给他开了抗抑郁药物。