Hides or disguises one's true feelings, intentions, or character; pretends or acts falsely (present tense, third person).
From Latin dissimulare with the modern English third person singular -s suffix. This is the present tense form used with he/she/it or singular nouns.
We see dissimulates constantly in social media—people carefully curate what they show, dissimulating their struggles while displaying only positive moments, which psychologists say creates widespread mental health problems.
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