Strong’s Greek
G1618 — ektenes
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ἐκτενής
ektenes — pronounced ek-ten-ace'
from 1614; intent:--without ceasing, fervent. see GREEK for 1614
2 occurrences in the KJV.
Acts 12:5
Peter therefore was kept in prison: but prayer was made without ceasing of the church unto God for him.
1 Peter 4:8
And above all things have fervent charity among yourselves: for charity shall cover the multitude of sins.