- not thankful; ungrateful.
- not repaid with thanks; thankless: an unthankful task.
Origin of unthankful
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for unthankful
Mary took the news of her great promotion in an unthankful spirit.Mary Gray
The Bible says He is good to all, and kind even to the unthankful.Who Are Happiest? and Other Stories
T. S. Arthur
But you women are an unthankful race, and don't deserve our kindness.An Egyptian Princess, Complete
We see it in his not withholding that abundance even from the unthankful.Thomas Paine, The Apostle of Liberty
John E. Remsburg
Nor shall we do dishonour to this realm, nor be unthankful for these benefits.Stories from Virgil
Alfred J. Church