without a cause, (in) vain(-ly)

Strong’s Dictionary of Greek Words:

Greek:
εἰκῆ
Transliteration:
eike
Phonic:
i-kay’
Meaning:
probably from 1502 (through the idea of failure); idly, i.e. without reason (or effect)
KJV Usage:
without a cause, (in) vain(-ly)