unbeatable definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
that cannot be defeated or surpassed
unbeatable definition by American Heritage Dictionary
Impossible to defeat or surpass: an unbeatable team; an unbeatable sales record.
- un·beatˈa·bly adverb