IPA: //ˈpæʃənət.nəs//
KK: /ˈpæʃənətnəs/
The state of having strong feelings or emotions about something, often related to love or enthusiasm.
Her passionateness for art was evident in every piece she created.
Passionateness → It is formed from "passion" (from Latin "passio", meaning suffering or enduring) and the suffix "-ness" (meaning the state or quality of). The word "passionateness" refers to the state of being passionate or having intense feelings.
Think of 'passion' as enduring strong feelings, and '-ness' indicates a state. So, passionateness means the state of having strong feelings.