Trendy
Definition 1 of 2
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Temporal Nature
The popularity of what's considered trendy can change quickly, often with seasons or years. Those sneakers were really trendy last year, not so much now.
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Context Specific
'Trendy' can refer to different items in various contexts like fashion, technology, or slang. Her blog is about the most trendy gadgets this month.
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Subjectivity
What is trendy to one person might not be to another; it's based on personal and cultural taste. I think vintage watches are trendy, even if they're not the latest style.