παραφρονεῖν
From LSJ
σταγόνες ὕδατος πέτρας κοιλαίνουσιν → 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
Greek > English (Woodhouse Verbs Reversed)
(see also παραφρονέω): be mad, lose one's wits