Lewis Short
perversĭtas (noun F) : perversus
* Frowardness, untowardness, perversity: quae est autem in hominibus tanta perversitas, ut, etc.,Cic. Or. 9, 31: opinionum,id. Tusc. 3, 1, 2: magna perversitas,id. Off. 1, 40, 145: alicujus,id. Q. Fr. 1, 1, 13, § 38: molestissima diligentiae perversitas,Quint. 1, 6, 34: morum,Suet. Aug. 62: incredibilis hominum,Cic. Fam. 1, 7, 7.
Charlton T. Lewis, Charles Short, A Latin Dictionary