Note 17 — Chapter XVIII · LACHES.
Reading edition
Plato, Lachês, 195 A. τὴν τῶν δεινων καὶ θαῤῥαλέων ἐπιστήμην καὶ ἐν πολέμῳ καὶ ἐν τοῖς ἄλλοις ἅπασιν. Lachês. — Ὡς ἄτοπα λέγει! — χωρὶς δή που σοφία ἐστὶν ἀνδρείας.
It appears from two other passages (195 E, and 198 B) that θαῤῥάλεος here is simply the negation of δεινὸς and cannot be translated by any affirmative word.