noun
the act of deceiving or concealing one's true feelings or motives
adjective
dissimulative (relating to or characterized by dissimulation)
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The politician's dissimulation was evident when he claimed to support the bill, but voted against it.
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She saw through his dissimulation and knew he was lying about his whereabouts.
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His dissimulation was so obvious, it was like he was trying to pull a fast one on us.
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The mask of dissimulation he wore to hide his true feelings eventually cracked, revealing his inner turmoil.