Meaning of sī:
sī
私
Adjective
personal; private; selfish
Wǒ de zhè shì yī gè sīrén wèntí.
我的这是一个私人私人问题。
This is a personal matter of mine.
Tā yǒu yīxiē sīrén de xiǎngfǎ bù yuàn fēnxiǎng.
他有一些私人的想法不愿分享。
He has some private thoughts that he is unwilling to share.
Tā zǒng shì biǎoxiàn de hěn sī.
他总是表现得很私。
He always behaves very selfishly.