n. An enemy; one who entertains hatred, grudge, or malice against another.n. An enemy in war; one of a nation or people at war with another, whether personally inimical or not; a hostile or opposing army; an adversary.n. An opponent; a malevolent or hostile agent or principle: as, a foe to all measures of reform; intemperance is a foe to thrift.n. One who or that which injures, harasses, or hinders anything: as, the climate is a foe to grape-culture.n. Synonyms Antagonist, Opponent, etc. See adversary.