αντίπαλος

Etymology: From Ancient Greek ἀντίπαλος (antípalos), from ἀντί (antí, 'against') + πάλη (pálē, 'wrestling'). The word literally means 'one who wrestles against'. The connection to wrestling (πάλη) gives this word a particularly physical, competitive connotation that distinguishes it from other words for opposition.