IPA: /ˈbʌmpɪər/
KK: /ˈbʌmpɪər/
Having many bumps or uneven surfaces; more uneven than something else.
The road became bumpier as we drove further into the countryside.
Comparative: bumpier
Superlative: bumpiest
Bumpier → It is formed from "bump" (of uncertain origin, possibly imitative of the sound) and the suffix "-ier" (meaning more). The word "bumpier" describes a surface that has more bumps than another surface.
Think of a surface that has 'more bumps' — the suffix '-ier' indicates a comparison, making 'bumpier' mean having more bumps.