IPA: //ˈsuːpərˌsmuːð//
KK: /ˈsuːpərˌsmuːð/
Extremely smooth, often used to describe a surface or texture that is exceptionally even and free of bumps or imperfections.
The supersmooth finish of the new car made it look very sleek and modern.
Comparative: supersmoother
Superlative: supersmoothest
Supersmooth is formed from "super-" (meaning above or beyond) and "smooth" (from Old English "smoother", meaning free from roughness). The word describes a surface that is exceptionally smooth, going beyond the usual smoothness.
Think of something that is 'above' ('super-') being 'smooth' — that's why supersmooth means extremely smooth.