persuasor
From LSJ
οὐκ ἂν λάβοις παρὰ τοῦ μὴ ἔχοντος → you can't take from one who doesn't have, you can't squeeze blood out of a turnip, you can't get blood out of a turnip, you can't get blood from a stone, you can't get blood out of a stone
Latin > English (Lewis & Short)
persuāsor: ōris, m. persuadeo,
I a convincer, one who persuades or prevails upon, Mart. Cap. 5, § 467.
Latin > French (Gaffiot 2016)
persuāsŏr, ōris, m. (persuadeo), celui qui persuade, qui entraîne : Cassiod. Var. 1, 4.
Latin > German (Georges)
persuāsor, ōris, m. (persuadeo), der Überreder (Ggstz. dissuasor), Mart. Cap. 5. § 467 u. Eccl.