阴晴不定

yīn qíng bù dìng

now cloudy, now sunny; changeable (weather or moods)

Character by character

阴yīn
overcast

晴qíng
clear

不bù
not

定dìng
settled

这几天阴晴不定，出门最好带把伞。

The weather keeps changing these days; better take an umbrella when you go out.

Tone: neutral.

Used of weather and, just as often, of a moody person: 老板的脸色阴晴不定.

Learn this in Lesson 15 · HSK 5: 梅雨、回南天与台风 (Plum rains, “returning south” days and typhoons)

A dialogue, a reading, word cards with audio and a drill that uses it, in Learn Chinese with Bao. The first lessons of every level are free.