Strong's G1421 — δυσερμήνευτος (adjective)
dusermeneutos (doos-er-mayn'-yoo-tos) adj.
1. difficult of explanation
[from G1418 and a presumed derivative of G2059]
KJV: hard to be uttered 
Root(s): G1418, G2059 
Hebrew root: ἑρμηνεύω
Occurrences: 1