nĕfans

antis, adj.

adjectival collat. form of ne-fas

I. impious, heinous (anteclass.): nefantia pro nefanda: Lucilius (Satyr. Lib. IV.): Tantalus qui poenas ob facta nefantia pendit, Non. 489, 14 sq.; Varr. Sat. Menip. 83, 4.
Lewis & Short
A Latin Dictionary, 1879
An open-access project