"dissemble" in the verb sense
1. feign, sham, pretend, affect, dissemble
make believe with the intent to deceive
"He feigned that he was ill"
"He shammed a headache"
2. dissemble, cloak, mask
hide under a false appearance
"He masked his disappointment"
3. dissemble, pretend, act
behave unnaturally or affectedly
"She's just acting"
Source: WordNet® (An amazing lexical database of English)
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