IPA: /ˌʌnəˌpriːʃiˈeɪʃən/
KK: /ʌnəˌpriːʃiˈeɪʃən/
A situation where someone does not recognize or value the worth of something or someone, often leading to feelings of ingratitude.
Her unappreciation of his efforts made him feel undervalued.
Unappreciation → It is formed from "un-" (meaning not) and "appreciation" (from Latin "appretiare", meaning to value or estimate). The word "unappreciation" means the state of not valuing or recognizing the worth of something.
Think of 'not' ('un-') valuing something ('appreciation') — that's why unappreciation means not recognizing its worth.