Strong's Concordance

Original word: κενῶς
Transliteration: kenós
Definition (short): vain
Definition (full): in vain

NAS Exhaustive Concordance

Word Origin: adverb from kenos
Definition: in vain
NASB Translation: no purpose (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

Adverb from kenos; vainly, i.e. To no purpose -- in vain.

see GREEK kenos

KJV: Do ye think that the scripture saith in vain, The spirit that dwelleth in us lusteth to envy?
NASB: Or do you think that the Scripture speaks to no purpose: "He jealously desires the Spirit which He has made to dwell in us"?