Having a tendency to follow fads; easily influenced by temporary fashions; inclined to adopt trends enthusiastically.
From 'fad' + '-y' suffix, which converts nouns into adjectives meaning 'having the quality of' or 'inclined to.' This is one of the most productive adjective-forming suffixes in English.
Faddy is primarily British English, while Americans more often say 'faddish'—two words from the same root diverged across dialects, and now they have slightly different connotations despite meaning nearly the same thing.
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