Definition of thankless
English to English adjective - not feeling or showing gratitude
Ungrateful heirs. How sharper than a serpent's tooth it is / To have a thankless child!.
source: WordNet 3.0 - Not acknowledging favors; not expressing thankfulness; unthankful; ungrateful.
source: Webster 1913 adjective satellite - not likely to be rewarded
Grading papers is a thankless task.
source: WordNet 3.0
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