G1500
εἰκῇ
in vain
εἰκῇ (-ῆ, Rec., as in cl.), adv., [in LXX: Pro.28:25 (εἰκῇ)* ;] __1. without cause or reason: Mat.5:22 (E, mg.), Col.2:18 (ICC). __2. vainly, fruitlessly, to no purpose: Rom.13:4, 1Co.15:2, Gal.3:4 4:11, Col.2:18. † (AS)
The KJV translates G1500 in the following manner:
vain (10x), cause (2x), vainly (2x)
Full Thayer's lexicon entry
εἰκῆ — eikē
εἰκῇ (L WH Relz εἰκῇ; cf. Alexander Buttmann (1873) Ausf. Spr. ii., p. 342; Buttmann, 69 (61); (Winers Grammar, § 5, 4 e.; Jelf, § 324 Obs. 6; Kühner, § 336 Anm. 7; especially Etym. Magn. 78, 26f; and references under the word Iota)), adverb; in Greek writings from Aeschylus down;
1. inconsiderately, without purpose, without just cause: Mat 5:22 R G Tr brackets; Rom 13:4 (i. e. 'not to hide it in the scabbard, but to draw it' Fritzsche); Col 2:18.
2. in vain; without success or effect: 1Co 15:2; Gal 3:4; Gal 4:11. (From Xenophon, Aeschylus down.)
6 occurrences
Matthew (1), Romans (1), I Corinthians (1), Galatians (2), Colossians (1)