ἑτέρως ἠδύνατο βέλτιον ἢ ὡς νῦν ἔχει κατεσκευάσθαι → otherwise they could have been constructed better than they are now (Galen, On the use of parts of the body 4.143.1 Kühn)
per-diffĭcĭlis: e, adj.,
I very difficult (class.), Cic. Part. 24, 84: quaestio, id. N. D. 1, 1, 1: navigatio, id. Att. 3, 8, 2.—Sup.: perdifficillimus aditus, exceedingly difficult, Liv. 40, 21.—Adv.: perdiffĭcĭlĭter, with great difficulty, Cic. Ac. 2, 15, 47.