δυσδιάσπαστος
From LSJ
Ubi idem et maximus et honestissimus amor est, aliquando praestat morte jungi, quam vita distrahi → Where indeed the greatest and most honourable love exists, it is much better to be joined by death, than separated by life.
English (LSJ)
ον,
A hard to break, τάξις Plb.15.15.7; hard to pull up, of a palisade, Ph.Bel.82.35.