Strong's #2756: kenos (pronounced ken-os')

apparently a primary word; empty (literally or figuratively):--empty, (in) vain.

Thayer's Greek Lexicon:

́

kenos

1) empty, vain, devoid of truth

1a) of places, vessels, etc. which contain nothing

1b) of men

1b1) empty handed

1b2) without a gift

1c) metaphorically destitute of spiritual wealth, of one who boasts of his faith as a transcendent possession, yet is without the fruits of faith

1d) metaphorically of endeavours, labours, acts, which result in nothing, vain, fruitless, without effect

1d1) vain of no purpose

Part of Speech: adjective

Relation: apparently a primary word

Citing in TDNT: 3:659, 426

Usage:

This word is used 19 times:

 

Mark 12:3: "him, and sent him away empty."
Luke 1:53: "with good things; and the rich he hath sent empty away."
Luke 20:10: "beat him, and sent him away empty."
Luke 20:11: "him also, and entreated him shamefully, and sent him away empty."
Acts 4:25: "and the people imagine vain things?"
Acts 4:25: "and the people imagine vain things?"
1 Corinthians 15:10: "me was not in vain; but I labored more abundantly than they"
1 Corinthians 15:14: "then is our preaching vain, and your faith is also"
1 Corinthians 15:14: "your faith is also vain."
1 Corinthians 15:58: "labor is not in vain in the Lord."
2 Corinthians 6:1: "grace of God in vain."
Galatians 2:2: "I should run, or had run, in vain."
Ephesians 5:6: "Let no man deceive you with vain words: for because of these things"
Philippians 2:16: "that I have not run in vain, neither labored in"
Philippians 2:16: "vain, neither labored in vain."
Colossians 2:8: "through philosophy and vain deceit, after the tradition"
1 Thessalonians 2:1: "that it was not in vain:"
1 Thessalonians 3:5: "our labor be in vain."
James 2:20: "wilt thou know, O vain man, that faith without"