Significatio vocis nefās | Babel Free

Definitiones

1. wrong; (moral) offense; wicked act; misdeed or misdoing
   indeclinable, no-genitive
2. forbidden deed or act
   indeclinable, no-genitive

Exempla

““‘Extīnxisse nefās tamen et sūmpsisse merentīs / laudābor poenās ….’” “‘Nevertheless, [for⟳ having] slain [such] an offender, and exacted [her] well-deserved punishments, I will be honored….’” (Aeneas in soliloquy speaks two perfect active infinitives – extinxisse and sumpsisse – as he considers whether to kill Helen.)”

Gradus CEFR