Deception:

Deception, beguilement, deceit, bluff, mystification, bad faith, and subterfuge are acts to propagate beliefs that are not true, or not the whole truth (as in half-truths or omission). Deception can involve dissimulation, propaganda, sleight of hand. It can employ distraction, camouflage or concealment. There is also self-deception as in bad faith.

Deception is a major relational transgression that often leads to feelings of betrayal and distrust between relational partners. Deception violates relational rules and is considered to be a negativeviolation of expectations. Most people expect friends, relational partners, and even strangers to be truthful most of the time. If people expected most conversations to be untruthful, talking and communicating with others would require distraction and misdirection to acquire reliable information. On a given day, it is likely that most human beings will either deceive or be deceived by another person.  From Wikipedia.