G0082–ἄδηλος–adēlos

Woe unto 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 give an uncertain sound, who shall prepare himself to the battle?

ἄδηλον adēlon “indistinct”