"喜怒不形于色"用英语怎么翻译?

man with few words

喜怒不形於色 (traditional, Pinyin xǐ nù bùxíngyúsè, simplified 喜怒不形于色)

* Literally: happiness and rage do not take shape on one's countenance

1. one's facial expression does not reveal any emotion; to not reveal any emotion on one's face

http://en.wiktionary.org/wiki/%E5%96%9C%E6%80%92%E4%B8%8D%E5%BD%A2%E6%96%BC%E8%89%B2

expressionless
hides his emotion well
well concealed of his emotion