noun
a person who is excessively interested in and follows the latest fashion, activity, or idea
adjective
relating to or characteristic of a faddist
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The nutritionist warned against following the latest dietary fads promoted by faddists.
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Don't listen to those faddists trying to sell you on the newest health craze.
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I don't trust those faddists who are always jumping on the bandwagon of trendy diets.
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She was considered a faddist in the fashion world, always ahead of the curve with her unique style choices.