IPA: /ˈbʌmpɪli/
KK: /ˈbʌmpɪli/
In a way that is uneven or rough, often causing jolts or bumps.
The car drove bumpily over the rocky road.
Bumpily → It is formed from "bump" (of uncertain origin, possibly imitative of the sound) and the suffix "-ily" (meaning in a manner). The word "bumpily" describes the manner of moving or occurring with bumps or irregularities.
Imagine something moving in a way that creates bumps — that's what 'bumpily' means, as it describes a manner filled with bumps.