Sluggish - Vine's Expository Dictionary of New Testament Words
Sluggish
[ 1,,G3576, nothros ]for which See SLOTHFUL, is translated sluggish" in Hebrews 6:12, RV; here it is set in contrast to confident and constant hope; in Hebrews 5:11 ("dull") to vigorous growth in knowledge. See DULL.