Resembling or characteristic of something dead; having a lifeless or dull quality.
From 'dead' + '-y' (suffix forming adjectives). This informal adjective formation follows common English patterns where '-y' converts nouns into descriptive adjectives (like 'muddy' from 'mud').
This is slang that shows how English speakers naturally create adjectives on the fly—if something 'dead' in vibe exists, you can just add '-y' and call it 'deady'!
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