per-grăvis — Lewis & Short
per-grăvis, e, adj.,
I 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.