Extended Strong's Greek Lexicon (Abbott-Smith based)
in vain
Usage: 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)