忽冷忽热

HSK 7-9

hūlěng-hūrè

alternating between cold and hot; irregular (temperature; attitude)

最近天气忽冷忽热

zuìjìn tiānqì hūlěng-hūrè

Recently, it's been cold and then hot.

他对我忽冷忽热

tā duì wǒ hūlěng-hūrè

He's been cold and then warm towards me.

别忽冷忽热，

Don't be cold and then warm.

小心感冒

bié hūlěng-hūrè, xiǎoxīn gǎnmào

Be careful not to catch a cold.