Pronunciation: /diˈsimyəˌlāt/
verb
[with object]
conceal or disguise (one’s thoughts, feelings, or character): a country gentleman who dissimulates his wealth beneath ragged pullovers [no object]: now that they have power, they no longer need to dissimulate
Derivatives
dissimulator
Pronunciation: /-ˌlātər/ noun
Origin:
late Middle English: from Latin dissimulat- 'hidden, concealed', from the verb dissimulare

Library of Congress via Wikipeda
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General Antonio López de Santa Anna attempted to dissimulate his rank by dressing as a foot soldier at San Jacinto where Sam Houston captured him after an astoundingly short battle. Remember the Alamo.