IPA: /dɪˈzaɪərəsnəs/
KK: /dɪˈzaɪərəsnəs/
The condition of wanting something or having a strong wish for something.
Her desirousness for adventure led her to travel the world.
Desirousness is formed from "desirous" (from Old French *desireux*, meaning full of desire) and "-ness" (meaning the state or quality of). The word "desirousness" refers to the state of being full of desire or longing for something.
Think of being 'full of desire' ('desirous') and the '-ness' indicating a state. This helps you remember that 'desirousness' means the quality of having strong desires.