2 sentences for 低落 (dī​luò — gloomy)

1. 考试没考好，他的情绪非常低落。

   kǎo​shì méi kǎo hǎo, tā de qíng​xù fēi​cháng dī​luò.

   He was in very low spirits because he didn't do well on the exam.

   Source: Dong Chinese Dictionary

2. 他这个人很情绪化，一点小事就会让他心情低落。

   tā zhè gè rén hěn qíng​xù​huà, yī​diǎn xiǎo​shì jiù huì ràng tā xīn​qíng dī​luò.

   He is very temperamental; even the slightest thing can make him feel down.

   Source: Dong Chinese Dictionary