formīdābĭlĭs — Lewis & Short
formīdābĭlĭs, e, adj.1. formido,
I causing fear, terrible, formidable (poet. and in post-class. prose; cf.
formidolosus): lumen,Ov. M. 2, 857:
nec formidabilis ulli,id. ib. 2, 174:
Orcus,id. ib. 14, 116:
aspectus,Gell. 14, 4, 2:
sonus,id. 19, 1, 17:
dolores et metus, per se formidabiles res,Sen. Ep. 123, 14.—In the neutr. adverbially:
formidabile ridens,Stat. Th. 8, 582.