IPA: /dɪˈdʒɛktɪnəs/
KK: /dɪˈdʒɛktɪdnəs/
The state of feeling sad or unhappy, often because of disappointment or loss.
After hearing the bad news, she was filled with dejectedness.
Dejectedness → It is formed from "de-" (meaning down or away) and "ject" (from Latin "jacere", meaning to throw) combined with the suffix "-ed" (indicating a state or condition) and "-ness" (indicating a quality or state). The word describes the state of being thrown down or feeling low in spirits.
Think of being 'thrown down' ('ject') and feeling 'away' ('de-') from happiness — that's what dejectedness means.