Dissimulation is a form of deception
Deception, beguilement, deceit, bluff, mystification, bad faith, and subterfuge are acts to propagate beliefs that are not true, or not the whole truth . Deception can involve dissimulation, propaganda, and sleight of hand. It can employ distraction, camouflage or concealment...

 in which one conceals the truth. It consists of concealing the truth, or in the case of half-truths
A half-truth is a deceptive statement that includes some element of truth. The statement might be partly true, the statement may be totally true but only part of the whole truth, or it may utilize some deceptive element, such as improper punctuation, or double meaning, especially if the intent is...

, concealing parts of the truth, like inconvenient or secret information. Dissimulation differs from simulation, in which one exhibits false information. Dissimulation commonly takes the form of concealing one's ability in order to gain the element of surprise over an opponent.

Francis Bacon has the following to say on the distinction between simulation and dissimulation, "Dissimulation, in the negative; when a man lets fall signs and arguments, that he is not, that he is...

Dissimulation, even the most innocent in its nature, is ever productive of embarrassment; whether the design is evil|evil or not, artifice is always dangerous|dangerous and almost inevitably disgraceful.

Jean de La Bruyère