The word "out-foxing" means to surpass or defeat by cunning or slyness. The antonyms of this word could, therefore, be straightforwardness, candor, frankness, honesty, and sincerity. These words imply ethical behavior and the absence of deceit or trickery, which is precisely the opposite of what "out-foxing" suggests. Additionally, other antonyms that could be used are straightforward, guileless, artless, open, and above-board. These are descriptive words that depict transparency, fairness, and moral uprightness, and are quite different from the conniving and underhanded behavior that "out-foxing" implies.