G0082–ἄδηλος–adēlos

Woe to you, scribes and Pharisees, hypocrites! For you are like hidden graves, and the men who walk over them don't know it."

ἄδηλα, adēla “unmarked,”

For if the trumpet gave an uncertain sound, who would prepare himself for war?

ἄδηλον adēlon “indistinct”