Relating to or characteristic of an adversary; showing the qualities of an opponent or enemy.
From Latin 'adversarius' (opponent, enemy) + English suffix '-ous'. The Latin root comes from 'adversus' meaning 'turned against.' The suffix '-ous' makes it adjectival, describing something that has the quality of being adversarial.
This word is delightfully rare—most people use 'adversarial' instead—but 'adversarious' follows the original Latin more directly, showing how English can borrow words multiple ways from the same root and let some become obsolete while others thrive.
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