monstrous Copy link Outline I. Misshapen and unnaturalII. Revolting to reason • monstrous: I. Misshapen and unnatural: monstrōsus (monstruōsus), portentōsus, prōdĭgiōsus: v. monster (I.) II. Revolting to reason: portentōsus (rare in this sense): what can be more m. than this (statement), quo quid fieri portentosius potest? Sen. Ep. 87, 19. Phr.: for it is m. to assert, nam illud vehementer rectae rationi repugnat, cf. Cic. Fin. 5, 26, 77: what so m. can be said or conceived, quid tam perversum [praeposterumve] dici, aut excogitari potest, id. Rab. Post. 13, 37.