Definitions

1. adjective

experiencing or showing a strong feeling of sadness or regret

“After the breakup, she felt bitterful and isolated.”

2. noun

a feeling of sadness or regret, especially one that is intense or overwhelming

“The bitterful mood hung over the city like a dark cloud.”

3. adverb

in a way that is characterized by strong feelings of sadness or regret

“She felt bitterful and disconnected from the world around her.”