unnaturalness - the quality of being unnatural or not based on natural principles

airs, pose - affected manners intended to impress others; "don't put on airs with me"

coyness, demureness - the affectation of being demure in a provocative way

preciosity - the quality of being fastidious or excessively refined

pretending, pretense, feigning, simulation, pretence - the act of giving a false appearance; "his conformity was only pretending"

attitude - a theatrical pose created for effect; "the actor struck just the right attitude"

radical chic - an affectation of radical left-wing views and the fasionable dress and lifestyle that goes with them