improviso
From LSJ
πολλάκις δοκεῖ τὸ φυλάξαι τἀγαθὰ τοῦ κτήσασθαι χαλεπώτερον εἶναι → it often proves harder to keep than to win prosperity | it is often harder for men to keep the good they have, than it was to obtain it
Latin > French (Gaffiot 2016)
imprōvīsō¹² (improvisus), à l’improviste : Pl. Rud. 1196 ; Cic. Div. 1, 50 ; Rep. 1, 7.
Latin > German (Georges)
imprōvīsō, Adv. (improvisus), unversehens, unvermutet, Plaut. asin. 310. Lucil. 1320. Cic. Verr. 2, 182 u.a. Caes. b. G. 1, 13, 5. Liv. 29, 32, 2 u.a. (s. Neue-Wagener Formenl.3 2, 624).