Strong’s Greek
G389 — anastenazo
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ἀναστενάζω
anastenazo — pronounced an-as-ten-ad'-zo
from 303 and 4727; to sigh deeply:--sigh deeply. see GREEK for 303 see GREEK for 4727
1 occurrence in the KJV.
Mark 8:12
And he sighed deeply in his spirit, and saith, Why doth this generation seek after a sign? verily I say unto you, There shall no sign be given unto this generation.