Strong's Concordance

Original word: ἀχάριστος
Transliteration: acharistos
Definition (short): ungrateful
Definition (full): ungracious, ungrateful

NAS Exhaustive Concordance

Word Origin: from alpha (as a neg. prefix) and charizomai
Definition: ungracious, ungrateful
NASB Translation: ungrateful (2).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

From a (as a negative particle) and a presumed derivative of charizomai; thankless, i.e. Ungrateful -- unthankful.

see GREEK a

see GREEK charizomai

KJV: But love ye your enemies, and do good, and lend, hoping for nothing again; and your reward shall be great, and ye shall be the children of the Highest: for he is kind unto the unthankful and to the evil.
NASB: "But love your enemies, and do good, and lend, expecting nothing in return; and your reward will be great, and you will be sons of the Most High; for He Himself is kind to ungrateful and evil men.
KJV: For men shall be lovers of their own selves, covetous, boasters, proud, blasphemers, disobedient to parents, unthankful, unholy,
NASB: For men will be lovers of self, lovers of money, boastful, arrogant, revilers, disobedient to parents, ungrateful, unholy,