ingratitude
🇺🇸
/ɪnˈɡrætɪtuːd/
🇬🇧
/ɪnˈɡrætɪtjuːd/
A lack of gratitude or appreciation for something done or received.
It was a sign of ingratitude when he didn't thank her for the gift.
彼が彼女に贈り物を感謝しなかったのは、恩知らずの兆しでした。