Strong’s Greek
G2761 — kenos
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
κενῶς
kenos — pronounced ken-oce'
adverb from 2756; vainly, i.e. to no purpose:--in vain. see GREEK for 2756
1 occurrence in the KJV.
James 4:5
Do ye think that the scripture saith in vain, The spirit that dwelleth in us lusteth to envy?