见人说人话，见鬼说鬼话
jiàn​rén​shuō​rén​huà, jiàn​guǐ​shuō​guǐ​huà

adaptable

见人说人话，见鬼说鬼话 (見人說人話，見鬼說鬼話) jiàn​rén​shuō​rén​huà, jiàn​guǐ​shuō​guǐ​huà
adaptable
to adjust one's speech and behavior to suit the audience or situation; versatile in communication
two-faced
to be insincere or hypocritical; saying different things to different people to serve one's own ends

Sources
Definitions
CC-CEDICT