noun, noun or participle which takes 'suru', intransitive verb
low spirits; dejection; discouragement
Describes a state of being dispirited, downcast, or losing motivation. Often used with する to mean 'become discouraged' or 'lose heart'.
試合に負けて、選手たちは意気消沈していた。
After losing the match, the players were completely dejected.
彼はその知らせを聞いて意気消沈した。
He became discouraged upon hearing the news.