IPA: //ˈslɪkɪst//
KK: /slɪkɪst/
The most smooth, shiny, or clever in a way that impresses others.
He is the slickest salesman in the company, always closing deals effortlessly.
Comparative: slicker
Superlative: slickest
Slickest → It is formed from "slick" (originating from Old Norse *slykr*, meaning smooth or slippery) and the suffix "-est" (meaning the most). The word "slickest" refers to something that is the most smooth or slippery in comparison to others.
Think of something that is the 'most smooth' or 'most slippery' — 'slick' means smooth, and '-est' indicates the highest degree.