IPA: /ˈtrɛndiest/
KK: /trɛndɪəst/
The most fashionable or popular at a particular time.
This season's trendiest outfits are all about bright colors and bold patterns.
Comparative: trendier
Superlative: trendiest
Trendiest → It is formed from "trend" (from Middle English *trende*, meaning to turn or revolve) and the suffix "-iest" (meaning most). The word "trendiest" refers to something that is the most fashionable or popular at a given time.
Think of the word 'trend' as something that is 'turning' in fashion, and '-iest' means the most. So, trendiest means the most fashionable or popular.