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English to English adjective
| 1 |
not feeling or showing gratitude |  | Example: ungrateful heirs
How sharper than a serpent's tooth it is / To have a thankless child!
source: wordnet30
| 2 |
Not acknowledging favors; not expressing thankfulness; unthankful; ungrateful. | | source: webster1913 adjective satellite
| 3 |
not likely to be rewarded | | Example: grading papers is a thankless task
source: wordnet30
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