IPA: /ˈtɑːrti/
KK: /ˈtɑrti/
The most flashy or showy in style or appearance, often in a way that is considered tasteless or overly bright.
She wore the tartiest dress at the party, which caught everyone's attention for all the wrong reasons.
Comparative: tartier
Superlative: tartiest
Tartiest → It is formed from "tart" (from Old French *tart*, meaning sharp or sour) and the suffix "-iest" (meaning most). The word "tartiest" means having the most sharp or sour taste.
Think of something that is the "most sharp or sour" — the root "tart" refers to that sharpness, and adding "-iest" indicates it is the highest degree.