δαπανηρῶς
From LSJ
ὅπου ἡ λεοντῆ μὴ ἐφικνεῖται, προσραπτέον ἐκεῖ τὴν ἀλωπεκῆν → if a lionskin doesn't do the trick, put on the fox | if force doesn't work, try cunning | where the lion's skin will not reach, it must be patched out with the fox's
French (Bailly abrégé)
adv.
à grands frais.
Étymologie: δαπανηρός.
Russian (Dvoretsky)
δᾰπᾰνηρῶς: с большими издержками (μὴ δ. τειχισθῆναι τὸ τεῖχος Xen.).