Strong's #1756: energes (pronounced en-er-gace')

from 1722 and 2041; active, operative:--effectual, powerful.

Thayer's Greek Lexicon:

̓́

energēs

1) active

Part of Speech: adjective

Relation: from G1722 and G2041

Citing in TDNT: 2:652, 251

Usage:

This word is used 3 times:

 

1 Corinthians 16:9: "a great door and effectual is opened unto me, and there are many"
Philemon 1:6: "of thy faith may become effectual by the acknowledging of every good thing"
Hebrews 4:12: "of God is quick, and powerful, and sharper than any"