Strong's Greek #82
ἄδηλον

ἄδηλον adēlon — 1 Occurrence

1 Corinthians 14:8 - Adj-AFS
GRK: γὰρ ἐὰν ἄδηλον σάλπιγξ φωνὴν
NAS: produces an indistinct sound,
KJV: give an uncertain sound,
INT: indeed if an uncertain a trumpet sound