IPA: //dɪsɪmjuˈleɪʃən//
KK: /dɪsɪmjuˈleɪʃən/
The act of hiding the truth or pretending to be something you are not, often to deceive others.
His dissimulation made it hard for anyone to trust him.
Dissimulation → It is formed from "dis-" (meaning apart) and "simulare" (meaning to pretend or feign). The word describes the act of pretending or concealing one's true feelings or intentions, effectively putting on a false front.
Think of 'pretending' ('simulare') while being 'apart' ('dis-') from your true self — that's what dissimulation means.