Where does “αγνωμοσύνη” come from?

αγνωμοσύνη (Greek) comes from Greek αγνώμων, from Ancient Greek ἀγνώμων, from Ancient Greek ἀ-, from Proto-Hellenic hə-, from Proto-Indo-European sm̥-, from Proto-Indo-European sem- — together, one.

αγνωμοσύνη (Greek): ingratitude, ungratefulness

Definitions

ingratitude, ungratefulness

Ancestry of “αγνωμοσύνη”, step by step

Step	Language	Word	Meaning
1	Greek	αγνώμων	ungrateful; ingrate
2	Ancient Greek	ἀγνώμων	—
3	Ancient Greek	ἀ-	The alpha privativum, used to make words that...
4	Proto-Hellenic	hə-	same; together
5	Proto-Indo-European	sm̥-	one; with, together
6	Proto-Indo-European	sem-	together, one

Every word from Proto-Indo-European sem- →Every word from Ancient Greek ἀ- →Every word from Proto-Indo-European sm̥- →