εἰκῆ eikē

Greek · Strong's G1500 · used 7 times in 6 verses

Meaning

idly, i.e. without reason (or effect)

In the King James Version: without a cause, (in) vain(-ly)

Derivation: probably from G1502 (εἴκω) (through the idea of failure);

Matthew 5:22 But I tell you that anyone who is angry with his brother will be subject to judgment. Again, anyone who says to his brother, ‘Raca,’ will be subject to the Sanhedrin. But anyone who says, ‘You fool!’ will be subject to the fire of hell.
Romans 13:4 For he is God’s servant for your good. But if you do wrong, be afraid, for he does not carry the sword in vain. He is God’s servant, an agent of retribution to the wrongdoer.
1 Corinthians 15:2 By this gospel you are saved, if you hold firmly to the word I preached to you. Otherwise, you have believed in vain.
Galatians 3:4 Have you suffered so much for nothing, if it really was for nothing?
Galatians 4:11 I fear for you, that my efforts for you may have been in vain.
Colossians 2:18 Do not let anyone who delights in false humility and the worship of angels disqualify you with speculation about what he has seen. Such a person is puffed up without basis by his unspiritual mind.