verb · referring to the loss of hair or becoming bald

他已步入中年，头顶开始微颓。

to crumble, collapse, or fall into decay physically or structurally

那座古庙的院墙早已颓毁。

feeling or showing a state of being dispirited, discouraged, or decadent

遭遇挫折后，他显得十分颓丧。