per-grăvis, e, adj., very weighty or grave, very important (class.): pergravia (haec), opp. levia, Ter. Hec. 3, 1, 12: testes, Cic. Cael. 26, 63: oratio, id. Sest. 50, 107.
Adv.: pergrăvĭter, very gravely, very seriously (class.): pergraviter offensus, Cic. Att. 1, 10, 2: reprehendere aliquem, id. de Or. 1, 53, 227.