Uneven means not level or smooth. It describes something that has differences or variations in height or surface, making it not flat or regular. Full definition
A mix of uneven surfaces and erratic torque feed will, even on a straight piece of road, induce a fair amount of shadow boxing. (automobilemag.com)
I will admit that I still need to focus whenever I'm wearing anything that's not flat to the ground on uneven surfaces. (tailoredandtrue.com)
The light conditions (from overhead or streaming through the gallery's long window) affect the viewer's already partial perspective by covering the surfaces in uneven shadows. (frieze.com)