Bumpy
Bumpy adjective - Not having a level or smooth surface.
Usage example: the bumpy road made the jeep bounce all over
Flat
Flat adjective - Having a surface without bends, breaks, or irregularities.
Usage example: preferred riding her bike on a flat road
Both words in one sentence
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Diddy Kong Racing DS has a fairly simple track maker — you draw a course, decide how bumpy or flat it is, and race.
Source: Level Editor - The best part was that at this stage of the war, even flat runways were in short supply, so the pilots had to land them in bumpy, rocky fields.
Cite this Source
Flat and Bumpy. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/bumpy/flat
Bumpy & Flat. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/bumpy/flat>.
Flat or Bumpy. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/bumpy/flat.
Google Ngram Viewer shows how "bumpy" and "flat" have occurred on timeline