IPA: /ʌnˈɡreɪtfəl.nəs/
KK: /ʌnˈɡreɪtfəl.nəs/
The condition of not showing appreciation or gratitude for something received.
Her ungratefulness was surprising after all the help she had received.
**Ungratefulness** → It is formed from "un-" (meaning not) and "grateful" (from Latin *gratus*, meaning pleasing or thankful) and the suffix "-ness" (meaning the state of being). The word "ungratefulness" means the state of not being thankful or appreciative.
Think of 'not' ('un-') being thankful ('gratus') — that's why ungratefulness means the state of not being thankful.