ἀπροφύλακτος
From LSJ
δρυὸς πεσούσης πᾶς ἀνὴρ ξυλεύεται → when the oak falls, everyone cuts wood | when an oak has fallen, every man gathers wood | on the fall of an oak, every man gathers wood | when an oak has fallen, every man becomes a woodcutter | one takes advantage of somebody who has lost his strength | one takes advantage of somebody who has lost his power | when the tree is fallen, every man goes to it with his hatchet
English (LSJ)
[ῠ], ον,
A not guarded against, unforeseen, Th.4.55. Adv. -τως D.C.38.41, Ach.Tat.8.1. 2 unguarded, Opp.H.5.106. II Act., using no precautions, Hld.6.13.