dissemble

Verb
  1. Make believe with the intent to deceive (synset 200839722)
    "He feigned that he was ill"; "He shammed a headache"
  2. Hide under a false appearance (synset 202152033)
    "He masked his disappointment"
  3. Behave unnaturally or affectedly (synset 201725433)
    "She's just acting"

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