Affectation:
- An attempt to assume or exhibit what is not natural or real; false display; artificial show; An unusual mannerism
In case you were wondering how I came across this word, I was reading a tumblr called 1001 rules for my unborn son. The author says "Let's get some things straight before I get old and uncool." Some are really neat. The one that I got this word from was:
135. Avoid affectations, lest they become habits.