δυσερμήνευτος G1421
dysermḗneutos · doos-er-mane'-yoo-tos · Adjective
from δυσ- and a presumed derivative of ἑρμηνεύω; difficult of explanation:--hard to be uttered.
1 Occurrence in the King James Bible
Hebrews 5:11Of whom we have many things to say, and hard to be uttered, seeing ye are dull of hearing.