He is depressed because his ambition can not be carried out.Depressed:blue, depressed look[1]。
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《New Tang Dynasty Book》Volume 84 - Biography 9: "(Li Mi) was hungry at the age of, and peeled the wood for food. He changed his name to Liu Zhiyuan. Professor Zhu gave it to him on his birthday. He was depressed and frustrated, and wept."
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《Chronicles of the Eastern Zhou Dynasty》The fifteenth time: "(Lian) quite went to Chu and became a general of Chu. Chu soldiers were inferior to Zhao, and he died of depression."
《Quick heart knitting》The seventh time: "Or they are not sold because of talent, depressed and frustrated."[2]
Zhou Youliang in the Qing Dynasty, "A Tale of the Plum Blossoms and Willows in the Pearl River", said, "But my two concubines are depressed and frustratedPen and inkIs the edge. "[3]