#4599 σθενόω sthenoo {sthen-o'-o}

 from sthenos (bodily vigour, probably akin to the base of G2476); TDNT - n/a; v

—Greek Word Study (Transliteration-Pronunciation Etymology & Grammar)

 1) to make strong, strengthen
    1a) of one's soul

—Thayer's (New Testament Greek-English Lexicon)

—Strong's (Greek Dictionary of the New Testament)

—NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries

 AV - strengthen 1; 1

—Exhaustive Concordance (KJV Translation Frequency & Location)