G1432 δωρεάν (dōreán)

KJV renderings: without a cause, freely, for naught, in vain
Strong's definition: gratuitously (literally or figuratively)
Derivation: accusative case of G1431 (δωρεά) as adverb;

From James Strong's public-domain dictionaries (G), JSON edition by OpenScriptures (CC-BY-SA). Every dotted-underline word in the text links here.