IPA: /rɪˈɡrɛtfəl/
KK: /rɪˈɡrɛtfəl/
The feeling of sadness or disappointment about something that has happened or been done, especially a loss or mistake.
Her regretfulness about the decision lingered for years.
Regretfulness is formed from "regret" (from Latin "regretare", meaning to weep or lament) and the suffix "-fulness" (meaning the state of being full of). The word describes the state of being full of regret or sorrow for something that has happened.
Think of feeling 'full of sorrow' for something that has happened — 'regret' means to lament, and '-fulness' indicates a state of being.