Question

Two-Faced false; dishonest

Accepted Answer

How can you trust her? Vera's two-faced, if you ask me. This expression comes from Roman mythology. The god Janus was the keeper of the gates of heaven. He had two faces so that he could be a better watchman. (It's like the expression, "two heads are better than one.") In the early 1600s a writer referred to someone who was a double-crosser as "two-faced." This captured the image of a lying person who tells you one thing and then tells your friend something else, or who smiles at you and then criticizes you to others.

Idiom	Two-Faced
Example	How can you trust her? Vera's two-faced, if you ask me.
Meaning	false; dishonest
Origin	This expression comes from Roman mythology. The god Janus was the keeper of the gates of heaven. He had two faces so that he could be a better watchman. (It's like the expression, "two heads are better than one.") In the early 1600s a writer referred to someone who was a double-crosser as "two-faced." This captured the image of a lying person who tells you one thing and then tells your friend something else, or who smiles at you and then criticizes you to others.

Two Faced Tells Trust Vera's False Dishonest Expression Roman