From Longman Dictionary of Contemporary Englishdissimulatedis‧sim‧u‧late /dɪˈsɪmjəleɪt/ verb [intransitive, transitive] formal HIDE/NOT SHOWto hide your true feelings or intentions, especially by lying→ See Verb table
Examples from the Corpus
dissimulate• Goneril and Regan used fraud to gain power, and now that they have it, no longer need to dissimulate.Origin dissimulate (1400-1500) Latin dissimulare, from simulare “to make like” 