Strong's G1414 · Greek

δυνατέω

dunateo · doo-nat-eh'-o

from 1415; to be efficient (figuratively)

Scholarly Lexicons

Abbott-Smith Manual Greek Lexicon

 3 δυνατέω , -ῶ ( δυνατός ), to be able, be powerful, mighty : c. inf., Ro 14:4 , II Co 9:8 ; absol., opp. to ἀσθενῶ II Co 13:3 .† 

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