I.destructive, ruinous, baleful, pernicious (syn.: “exitialis, capitalis): perniciosae leges,” Caes. B. C. 1, 7: “scripta auctori perniciosa suo,” Ov. Tr. 5, 1, 68.—Comp.: “morbi animi perniciosiores sunt, quam corporis,” Cic. Tusc. 3, 3, 5; Sall. J. 46, 8.—Sup.: “perniciosissimum fore,” Nep. Ages. 6, 2; Inscr. Grut. 113, 2.—As subst.: pernĭcĭōsa , ōrum, n., baneful things: “petuntur,” Juv. 10, 54; cf.: “inter perniciosissima numerare,” Vell. 2, 7, 5.—Hence, adv.: pernĭcĭōsē , destructively, ruinously, perniciously: “multa perniciose, multa pestifere sciscuntur in populis,” Cic. Leg. 2, 5, 13: “luxuriat vitis,” Plin. 17, 22, 35, § 178.—Comp., Cic. Leg. 3, 14, 32.—Sup., Aug. Ep. 39.
pernĭcĭōsus , a, um, adj. pernicies,