injudicious
From LSJ
Μιμοῦ τὰ σεμνά, μὴ κακῶν μιμοῦ τρόπους → Graves imitatormores, ne imitator malos → Das Edle nimm zum Vorbild, nicht der Schlechten Art
P. and V. ἄβουλος, ἀσύνετος, Ar. and P. ἀνόητος; see foolish.
off one's guard: P. and V. ἀφύλακτος.