LSJ Gloss:κυβείαdice-playing, dicingDodson:κυβείαtrickery, sleight(lit: playing with dice, gaming, hence) trickery, sleight.
Strong's:κυβεία gambling, i.e. (figuratively) artifice or fraudDerivation: from κύβος (a "cube", i.e. die for playing);KJV Usage: sleight.
TBESG:κυβείαcunningG:N-F κυβία (Mt. -εία, and so Rec.), -ας, ἡ (< κύβος, a cube, a die), dice-playing; metaph., trickery, sleight: Eph.4:14.† (AS)
Thayer:1) dice playing 2) metaph. the deception of men, because dice players sometimes cheated and defrauded their fellow players
κυβεία kubeia koo-bi'-ah From κύβος kubos (a “cube”, that is, die for playing); gambling, that is, (figuratively) artifice or fraudKJV Usage: sleight.