Strong’s Greek
G3576 — nothros
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
νωθρός
nothros — pronounced no-thros'
from a derivative of 3541; sluggish, i.e. (literally) lazy, or (figuratively) stupid:--dull, slothful. see GREEK for 3541
2 occurrences in the KJV.
Hebrews 5:11
Of whom we have many things to say, and hard to be uttered, seeing ye are dull of hearing.
Hebrews 6:12
That ye be not slothful, but followers of them who through faith and patience inherit the promises.