sinvergüenza
/simbeɾˈɡwenθa/ · B2 · adj
shameless, brazen
sin vergüenza = without shame, so a shameless person or scoundrel
Spanish sin means without, and vergüenza means shame. Vergüenza comes from Latin verecundia, meaning modesty, which also gave English the rare word verecund (bashful). A sinvergüenza is someone with no shame at all.