" duplicitous "

 [ "duplicitous" ]

1: deceitful, treacherous, liar

  * e.g.,  ... Don't trust Top Smith from training he is a duplicitous mother fucker. His documents are usually false too. 

 [ "Duplicitous" ]

1: Given to or marked by deliberate deceptiveness in behavior and/or speech. Trickery, two facedness, purposeful deception.

  * e.g.,  ... "You are a duplicitous homo sapien" said Zo'or to Agent Sandoval. 

 [ "Duplicitous snake" ]

1: People who pretend they love you; badmouth you to those close to you behind your back; ruin your life whilst apologising for doing so; keep saying they want to break up but refusing to leave when you try to get them to. Synonyms: Bjorn Peter Alan; Russell

  * e.g.,  ... Do not be a duplicitous snake to her! 

 [ "duplicitous" ]

1: Trickery or with an intention of misleading. Often associated with back-stabbing or treacherous behavior.

  * e.g.,  ... “Watching him drink that water you put cheese, paper, and a pen in is such a duplicitous move!”