Strong’s Greek
G4659 — skuthropos
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
σκυθρωπός
skuthropos — pronounced skoo-thro-pos'
from skuthros (sullen) and a derivative of 3700; angry-visaged, i.e. gloomy or affecting a mournful appearance:--of a sad countenance. see GREEK for 3700
2 occurrences in the KJV.
Matthew 6:16
Moreover when ye fast, be not, as the hypocrites, of a sad countenance: for they disfigure their faces, that they may appear unto men to fast. Verily I say unto you, They have their reward.
Luke 24:17
And he said unto them, What manner of communications are these that ye have one to another, as ye walk, and are sad?