The word "out-foxes" means to outwit or outsmart someone. The antonym of "out-foxes" is to be outwitted or outsmarted. This can be represented by words like "foiled," "tricked," or "deluded." To be "out-foxed" means to have one's plans frustrated or to have been taken advantage of. Other antonyms that can be associated with "out-foxes" include "confused," "deceived," and "outmaneuvered." Essentially, any word that implies a failure to outsmart someone or to have one's plans disrupted can be categorized as an antonym of "out-foxes.