Strong's Concordance

Original word: μεγαλεῖος
Transliteration: megaleios
Definition (short): mighty
Definition (full): magnificent, splendid

NAS Exhaustive Concordance

Word Origin: from megas
Definition: magnificent, splendid
NASB Translation: mighty deeds (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

From megas; magnificent, i.e. (neuter, plural as noun) a conspicuous favor, or (subjectively) perfection -- great things, wonderful works.

see GREEK megas

KJV: Cretes and Arabians, we do hear them speak in our tongues the wonderful works of God.
NASB: Cretans and Arabs-- we hear them in our own tongues speaking of the mighty deeds of God."