Strong's Concordance

Original word: νωθρός
Transliteration: nóthros
Definition (short): dull
Definition (full): sluggish, slothful

NAS Exhaustive Concordance

Word Origin: akin to nóthés (sluggish, slothful)
Definition: sluggish, slothful
NASB Translation: dull (1), sluggish (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

From a derivative of nothos; sluggish, i.e. (literally) lazy, or (figuratively) stupid -- dull, slothful.

see GREEK nothos

KJV: Of whom we have many things to say, and hard to be uttered, seeing ye are dull of hearing.
NASB: Concerning him we have much to say, and it is hard to explain, since you have become dull of hearing.
KJV: That ye be not slothful, but followers of them who through faith and patience inherit the promises.
NASB: so that you will not be sluggish, but imitators of those who through faith and patience inherit the promises.