Strong's G4599 · Greek

σθενόω

sthenoo · sthen-o'-o

from sthenos (bodily vigor; probably akin to the base of 2476); to strengthen, i.e. (figuratively) confirm (in spiritual knowledge and power)

Scholarly Lexicons

Abbott-Smith Manual Greek Lexicon

 1 *† σθενόω , -ῶ ( σθένος , strength ), to strengthen : c. acc., I Pe 5:10 (Hesych.).† 

G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain