Verses with the word unthankful in the Apocrypha (3 verses):
2 Esdras 8:60
But they which be created have defiled the name of him that made them, and were unthankful unto him which prepared life for them.
Wisdom of Solomon 16:29
For the hope of the unthankful shall melt away as the winter's hoar frost, and shall run away as unprofitable water.
And he that is of an unthankful mind will leave him [in danger] that delivered him.