πενθημιμερής
From LSJ
εἰ πλείονα δ' εἰδείης Σισύφου → if you were more intelligent than Sisyphus
English (LSJ)
ές,
A consisting of five halves, i. e. of two and a half : in Prosody, τομὴ π. the caesura after two feet and a half, as in Hexam. and Iamb. Trim., Aristid. Quint.1.25, etc.; τὸ π. (with or without μέτρον) the first two feet and a half of a verse, Quint.Inst.9.4.78, Heph. 7.3, al., Sch.Ar.Av.627.