ὑπονοητέον
From LSJ
πέτρην κοιλαίνει ρανὶς ὕδατος ἐνδελεχείῃ → constant dropping wears away a stone, constant dripping will wear away the hardest stone, little strokes fell big oaks, constant dripping wears the stone, constant dropping wears the stone, constant dripping will wear away a stone
English (LSJ)
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».