ὑπονοητέον
From LSJ
κοινὴ γὰρ ἡ τύχη καὶ τὸ μέλλον ἀόρατον → fortune is common to all, the future is unknown | fortune is common to all and the future unknown | fate is common to all and the future unknown
English (LSJ)
A one must suppose, Chrysipp. ap. Gal.5.435, Str.16.4.27, Ph.1.581.
Greek (Liddell-Scott)
ὑπονοητέον: ῥημ. ἐπίθ., τοῦ ὑπονοῶ, δεῖ ὑπονοεῖν, Στράβ. 784, Φίλων 1. 581. ― Καθ’ Ἡσύχ.: «τοπαστέον· ὑποληπτέον, ὑπονοητέον».