IPA: /ˈrʌfɪst/
KK: /rʌfɪst/
The most uneven or harsh in texture or surface; having many bumps or irregularities.
The roughest part of the trail was difficult to walk on.
Comparative: rougher
Superlative: roughest
Roughest → It is formed from "rough" (from Old English "ruh", meaning uneven or coarse) and the suffix "-est" (meaning the most). The word "roughest" describes something that is the most uneven or coarse in texture.
Think of something that is the 'most uneven' or 'coarse' — 'rough' means uneven, and '-est' indicates the highest degree.