Lewis Short
(adjective) : prae-vārus, a, um
* Very irregular or unsteady (very rare).
* Lit.: venarum pulsus praevaros (al. praeclaros, i. e. certos, distinctos),App. Flor. p. 362, 17.
* Trop., very perverse: quid enim tam praevarum? Cic. Fragm. ap. Isid. Orig. 10, 233.
Charlton T. Lewis, Charles Short, A Latin Dictionary