dissimulate
Concise Oxford English Dictionary © 2008 Oxford University Press:
dissimulate /dɪˈsɪmjʊleɪt/
▶verb hide or disguise one's thoughts or feelings.
– derivatives
dissimulation noun,
dissimulator noun.
dissimulation noun,
dissimulator noun.
– origin ME: from L. dissimulat-, dissimulare ‘to conceal’.
'dissimulate' also found in these Oxford entries:

