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Definition of Unthankful
1. Adjective. Not feeling or showing gratitude. "How sharper than a serpent's tooth it is / To have a thankless child!"
Exact synonyms: Thankless, Ungrateful
Similar to: Unappreciative
Antonyms: Grateful
Derivative terms: Ungratefulness
Similar to: Unappreciative
Antonyms: Grateful
Derivative terms: Ungratefulness
Definition of Unthankful
1. Adjective. Not thankful; ungrateful. ¹
¹ Source: wiktionary.com