The phrase "worthy adversary" means an opponent or competitor who is deserving of respect or admiration for their skills, abilities, or qualities. Full definition
And as much as it pains me to say, Oldman's character is just too low rent to provide a real worthy adversary for Eli. (moviereviewsfromthedark.com)
As far as the all - important romantic obstacle goes, Allie's mother (Joan Allen) proves as worthy an adversary as any Capulet to their love. (nationalreview.com)
Although they remain mostly unchanged when compared to the Ganado, the Haunted make for worthy adversaries in their own right. (gamerassaultweekly.com)