dissimulate
To practise deception by concealment or omission, or by feigning a false appearance; to dissemble.
intransitive
To disguise or hide by adopting a false appearance; to dissemble.
transitive
[P]ublic feeling required the meagreness of nature to be dissimulated by tall barricades of frizzed curls and bows.
To connive at; to wink at; to pretend not to notice.
rare, transitive
That al thyng be forgiven to theim that be olde and broken, and to theim that be yonge and lusty to dissimulate for a time, and nothyng to be forgiuen to very yong children.
Where it comes from
Inherited from Middle English dissimulaten, dissimilaten, from Latin dissimulātus + -en (“verb-forming suffix”), perfect passive participle of dissimulō (“to conceal, to pretend, to neglect”) (see -ate (verb-forming suffix)), from dissimilis (“unlike”) + -ō (verb-forming suffix). Compare the obsolete dissimule (“to conceal, disguise”), from Old French dissimuler (French dissimuler), ultimately from the same Latin root. Doublet of dissemble, dissimilate, and dissimule.
Adapted from the Wiktionary entry dissimulate (CC BY-SA 4.0).