G0884–ἀχάριστος–acharistos

But love your enemies, and do good, and lend, expecting nothing back; and your reward will be great, and you will be children of the Most High; for he is kind toward the unthankful and evil.

ἀχαρίστους acharistous “ungrateful”

For men will be lovers of self, lovers of money, boastful, arrogant, blasphemers, disobedient to parents, unthankful, unholy,

ἀχάριστοι, acharistoi “ungrateful,”