IPA: //ˈfædiər//
KK: /ˈfædiər/
More likely to be influenced by trends or fads; showing a preference for what is currently popular or fashionable.
The faddier styles of clothing quickly went out of fashion after the season ended.
Comparative: faddier
Superlative: faddiest
The word 'faddier' originates from the word 'faddy' (meaning overly concerned with trivial matters) combined with the suffix '-er' (meaning a person who). Thus, 'faddier' refers to a person who is more faddy or excessively concerned with trivialities.
Think of someone who is 'more' ('-er') concerned with 'trivial matters' ('faddy') — that's what a faddier is.