δυσκαταμάχητος
From LSJ
κάλλιστον τὸ δικαιότατον, λῷστον δ' ὑγιαίνειν → nothing is more beautiful than being just, but nothing is more pleasant than being healthy | Most beautiful is what is most just; the best thing is to be healthy.
English (LSJ)
[μᾰ], ον,
A hard to overcome, D.S.3.35; νόσος (sc. πενία) Lib.Decl.34.4.