IPA: //daʊnˈhɑːrtɪdnəs//
KK: /daʊnˈhɑːrtɪdnəs/
The state of feeling sad or depressed.
After hearing the bad news, she was filled with downheartedness.
Downheartedness → It is formed from "down" (from Old English "dūne", meaning in a lower position) and "hearted" (from "heart", meaning the emotional center) combined with the suffix "-ness" (meaning the state of being). The word describes the state of having a heart that feels low or depressed.
Think of feeling 'down' in a 'lower position' and how that affects your 'heart' — downheartedness means the state of feeling low in spirit.