perniciabilis

pernĭcĭābĭlis, e, adj. [pernicies],

destructive , ruinous , pernicious : id perniciabile reo, Tac. A. 4, 34: nix oculis perniciabilis, Curt. 7, 3, 13: pestilentia quae magis in morbos longos quam in perniciabilis evasit, Liv. 27, 23, 7.