Being antonyms; having opposite meanings or expressing direct opposites.
Derived from antonym with the adjectival suffix '-ous,' which comes from Latin -osus meaning 'full of' or 'characterized by.' The '-ous' suffix is one of the most productive adjectival endings in English for creating descriptive adjectives from nouns.
Some of the most antonymous word pairs in English reveal surprising cultural values! For instance, we have rich pairs like big/small, but notice how few perfect antonyms exist for abstract concepts like 'beautiful'—suggesting that languages reflect what matters most to their speakers.
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