Other forms: patchier
If you describe something as patchy, you mean it's uneven or irregular, like your patchy front lawn with brown spots scattered among the green tufts of grass.
Patchy things can appear spotty or mottled in color, or feel rough and bumpy to the touch. If your dog gets fleas and scratches too much, his fur might be patchy. And, if the sky is speckled with clouds, it also looks patchy. You can also call something that's inconsistent patchy: "Your math homework is patchy — some days you do it all, and others you only answer one or two questions."