ἐνευδαιμονέω
From LSJ
τοῦ δὲ πολέμου οἱ καιροὶ οὐ μενετοί → in war, opportunities won't wait | the chances of war will not wait (Thucydides 1.142.2)
English (LSJ)
A to be happy in, Th.2.44, D.S.34.3; τῷ καιρῷ Lib.Or. 14.43.
German (Pape)
[Seite 839] darin, dabei glücklich sein, τινί, Thuc. 2, 44 u. Sp.