infacundus
From LSJ
ἀλλ᾽ ἀμφὶ τοῖς σφαλεῖσι μὴ 'ξ ἑκουσίας ὀργὴ πέπειρα → to those who err in judgment, not in will, anger is gentle | men's wrath is softened toward those who have erred unwittingly
Latin > English (Lewis & Short)
in-fācundus: a, um, adj.,
I ineloquent (not in Cic. or Cæs.): vir acer, nec infacundus, Liv. 4, 49, 12; Suet. Claud. 40; Gell. 18, 3, 6.— Comp.: infacundior, Liv. 7, 4, 4.