凹 āo : a depression; indentation; concave; hollow

Big5: , Unicode: 51f9 (凹),
Links: MT, Cantonese, Ld, Chinese Language

凹 陷 āo xiàn : hollow; sunken; depressed

坳 ào : a depression; cavity; hollow

Big5: , Unicode: 5773 (坳),
Links: MT, Cantonese, Ld, Chinese Language

懊 喪 ào sāng : dejected; despondent; depressed

拗 陷 ào xiàn : geological depression

憋 悶 biē men : feel oppressed; be depressed; be dejected

不 景 氣 bù jǐng qì : depression; recession; slump

悵 [怅] chàng : regretful; upset; despair; depressed

Big5: , Unicode: 60b5 (悵),
Links: MT, Cantonese, Ld, Chinese Language

盆 地 pén dì : basin (low-lying geographical feature); depression

窪 [洼] wā : depression; sunken; swamp

Big5: , Unicode: 7aaa (窪),
Links: MT, Cantonese, Ld, Chinese Language

蕭 條 xiāo tiáo : (economic) depression