Strong's G2758 — κενόω (verb)
kenoo (ken-oh'-o) v.
1. to make empty
2. (figuratively) to abase, neutralize, falsify
[from G2756]
KJV: make (of none effect, of no reputation, void), be in vain 
Root(s): G2756 
Hebrew root: κενός
Occurrences: 5