Where does “ἀδικία” come from?

ἀδικία (Greek) comes from Ancient Greek ᾰ̓δῐκῐ́ᾱ.

Ancestry of “ἀδικία”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	ᾰ̓δῐκῐ́ᾱ	—