The Tipiṭaka in Three Languages

Nikkhepakaṇḍa

Abhidhammapiṭaka · Dhammasaṅgaṇī · Vol. 34 · Section 800

[800] Therein, what is shamelessness (ahirika)? That which is the absence of shame at what one ought to be ashamed of, the absence of shame at the attainment of evil, unwholesome phenomena (dhammā) — this is called shamelessness.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 2 other places