graviora manent (L: greater afflictions remain) The worst is yet to come. (cf. Virgil, Aeneis 6: 84)

grex venalium (L) a venal throng　― Suetonius, De Claris Rhetoribus l.

grosse tte et peu de sens (F) a big head and little sense.

gutta cavat lapidem, non vi, sed saepe cadendo (L) The drop hollows out the stone not by force, but by constant falling.　― Gariopontus, Passionarius 1: 17 (cf. A rolling stone gathers no moss; 「点滴石を穿(_うが)つ」).