demoralize
demoralise, / dɪˈmɔrəlaɪz; ?@ -ˈmɔ:r-; dɪ`mɔrəl-ˌaɪz/ v [Tn]
weaken the courage or self-confidence of (sb); dishearten 削弱（某人）的勇气或自信心; 使泄气; 使士气低落
The troops were thoroughly demoralized by this set-back. 这一挫败使部队士气丧失殆尽.
feel very demoralized 觉得十分沮丧
The news is very demoralizing. 这消息很使人泄气. Cf 参看 dispirit.