κενόω (kenóōken-o'-overbto empty)
[Grk] κενόω LN: 76.27, 87.70 GK: G3033 Hebrew: עָמָל
Derivation: from κενός;
Strong's: to make empty, i.e. (figuratively) to abase, neutralize, falsify
KJV: --make (of none effect, of no reputation, void), be in vain.
See: κενός