IPA: //ˈmɪs.tʃə.vəs.nəs//
KK: /ˈmɪs.tʃə.vəs.nəs/
The quality or state of being playful in a way that causes trouble or annoyance.
The child's mischievousness often led to funny situations at home.
**Mischievousness** → It is formed from "mischievous" (from Old French *meschever*, meaning to bring misfortune) and the suffix "-ness" (meaning the state or quality of). The word "mischievousness" refers to the state of being mischievous or causing trouble in a playful way.
Think of the word 'mischievous' which means causing playful trouble, and remember that 'mischievousness' describes the quality of being that way.
No commonly confused words.