μοχθεῖν τε βροτοῖσ(ιν) άνάγκη → and you mortals must endure trouble (Euripides' Hippolytus 208)
of ground: P. and V. πετρώδης, τραχύς, V. κραταίλεως, λεπαῖος; see rugged.
of rock: under rock.