n. state characterized by emotions ranging from mild discontentment to deep grief
n. 苦恼；忧愁
1. Her unhappiness was evident in her sad expression.
她的痛苦在她忧伤的表情中显而易见。
2. Many people experience unhappiness at some point in their lives.
许多人在生活中的某个时刻都会经历痛苦。
3. He tried to find ways to overcome his unhappiness.
他试图找到克服自己痛苦的方法。