The antonyms for "out-fox" are quite straightforward. Instead of outsmarting or outwitting, one could be outdone, outmatched, or defeated. Some other antonyms for the term could be outmaneuvered, outplayed, or outflanked. Essentially, any word that denotes someone no longer having the upper hand or being overpowered can be considered an antonym for "out-fox." It is important to note that while these words may seem negative, they are simply the opposite of the concept contained within the word "out-fox." Each of these words has its use in certain situations, and their opposite, "out-foxing," can be a useful tool in certain circumstances as well.