(adjective) : portentōsus (-tŭōsus), a, um, portentum
* Full of monsters, monstrous, portentous, unnatural, hideous, revolting, etc. (class., but not used of abstract things till after the Aug. period): si quando aliqua portentosa aut ex pecude aut ex homine nata dicuntur,Cic. Div. 2, 28, 60: puer portentoso parvoque capite,Suet. Dom. 4: portentosissima genera ciborum,id. Calig. 37: labyrinthi, vel portentosissimum humani impendii opus,Plin. 36, 13, 19, § 84: mendacia Graeciae,id. 5, 1, 1, § 4: scientia,i. e. of wonderful things,id. 23, 1, 27, § 58: ars,id. 30, 1, 2, § 8: ingenia,id. 9, 41, 65, § 140: quo quid fieri portentosius potest?Sen. Ep. 87, 19: oratio portentosissima,id. ib. 114, 8.

s. TLL