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Definition of Thankless
1. Adjective. Not feeling or showing gratitude. "How sharper than a serpent's tooth it is / To have a thankless child!"
Exact synonyms: Ungrateful, Unthankful
Similar to: Unappreciative
Antonyms: Grateful
Derivative terms: Ungratefulness
Similar to: Unappreciative
Antonyms: Grateful
Derivative terms: Ungratefulness
2. Adjective. Not likely to be rewarded. "Grading papers is a thankless task"
Definition of Thankless
1. a. Not acknowledging favors; not expressing thankfulness; unthankful; ungrateful.
Definition of Thankless
1. [adj]