dis ‧ sim ‧ u ‧ late /dɪˈsɪmjəleɪt, dɪˈsɪmjʊleɪt/ BrE AmE verb [intransitive and transitive] formal
[ Date: 1400-1500 ; Language: Latin ; Origin: dissimulare , from simulare 'to make like' ]
to hide your true feelings or intentions, especially by lying