ματαίωσις
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.
Greek (Liddell-Scott)
ματαίωσις: ἡ, ματαιότης, Ἀθαν. τ. 1, σ. 1041Α.