The quality of being ungrateful; failure to appreciate or acknowledge kindness or help received.
From Latin 'ingratus' (ungrateful, from 'in-' + 'gratus' = pleasing) + '-tude' (quality suffix). The concept has been recognized as a moral failing for thousands of years.
Shakespeare called ingratitude 'sharper than a serpent's tooth,' suggesting that it's worse than betrayal because it involves forgetting love—it's why humans across cultures see gratitude as fundamental to being civilized!
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