ANAIDEIA was the goddess or spirit (daimon) of ruthlessness, shamelessness, and unforgivingness. She was a companion of Hybris (Violence). Her opposite number was Eleos (Mercy).
Probably a daughter of NYX or ERIS though nowhere stated
Pausanias, Description of Greece 1. 28. 5 (trans. Jones) (Greek travelogue C2nd A.D.) :
"The unhewn stones [in the Areopagos, Athens] on which stand the defendants and prosecutors, they call the stone of Hybreos (Outrage) and of Anaideia (Ruthlessness)."
- Pausanias, Description of Greece - Greek Travelogue C2nd A.D.