disheartenest

[dɪs'hɑːt(ə)n]
vt.
使泄气，使气馁，使沮丧，使灰心，使失去勇气(或热情、信心、希望等)：
She's easily disheartened by difficulties.
她遇到困难很容易泄气。
News of another job rejection disheartened her badly.
求职再次遭到拒绝的消息使她非常灰心。