ambidextrous; double dealing; have two faces; play a double game (/the double dealer); put on a front; speak and act in one way in public but actually aim at sth quite different; think (in) one way but act (in) another;two-faced; wholly insincere
? 此人～，從來就不可靠。This fellow has two faces and is never reliable.
表里不一biǎo lǐ bù yī
形容思想和言行不一樣。think in one way and behave in another, put on a front, say one thing and mean another, ambidextrous, have two faces