Abbott-Smith Manual Greek Lexicon
κραταιός (G2900)
1 κραταιός , -ά, -όν ( κράτος ), (in cl. poët. form of κρατερός ), [in LXX chiefly for חָזָק and cognates;] strong , mighty : I Pe 5:6 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain