dissimulation

DISSIMULATION, n. [L., to make like; like.] The act of dissembling; a hiding under a false appearance; a feigning; false pretension; hypocrisy. Dissimulation may be simply concealment of the opinions, sentiments or purpose; but it includes also the assuming of a false or counterfeit appearance which conceals the real opinions or purpose. Dissimulation among statesmen is sometimes regarded as a necessary vice, or as no vice at all.