Covered with or containing gunk; sticky, slimy, and unpleasantly dirty.
From 'gunk' plus the adjective suffix '-y', which turns nouns into descriptive words. The suffix '-y' is one of English's most productive ways to create adjectives.
The beauty of '-y' suffixes is how they instantly transform nouns into adjectives—'gunk' becomes 'gunky' just like 'grit' becomes 'gritty'—and it's a pattern so old and common that we barely notice we're doing it!
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