G0082–ἄδηλος–adēlos

Woe to you, scribes and Pharisees, hypocrites! for ye are as graves which appear not, and the men that walk over them are not aware of them.

ἄδηλα, adēla “unmarked,”

For if the trumpet shall give an uncertain sound, who will prepare himself for battle?

ἄδηλον adēlon “indistinct”