IPA: /dɪˈlaɪtɪdnəs/
KK: /dɪˈlaɪtɪdnəs/
The state of feeling very happy or pleased about something.
Her delightedness was evident when she received the good news.
Delightedness is formed from "delight" (from Old French *delit*, meaning pleasure or joy) and "-edness" (a suffix indicating a state or condition). The word "delightedness" refers to the state of being filled with joy or pleasure.
Think of the word 'delight' which means pleasure, and the suffix '-edness' that indicates a state. This helps you remember that 'delightedness' is the state of experiencing joy.