Inclined to grin; characterized by smiling or grinning frequently.
From 'grin' plus the adjective-forming suffix '-y' (or '-ny'), following the pattern of English adjectives like 'funny,' 'sunny,' and 'rainy' that describe qualities or tendencies.
The '-y' suffix is one of English's most productive tools for turning nouns into adjectives—'rain' becomes 'rainy,' 'sleep' becomes 'sleepy,' and 'grin' becomes 'grinny.' It's a shortcut our brains use constantly!
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