IPA: /ˈpætʃi/
KK: /ˈpætʃi/
Having areas that are not uniform or consistent; uneven in quality or appearance.
The paint job on the wall was patchy, with some areas well covered and others barely touched.
Patchy → It is formed from "patch" (from Middle English *pacche*, meaning a piece or a small area) and the suffix "-y" (meaning characterized by). The word "patchy" describes something that is characterized by pieces or areas that are uneven or irregular.
Think of a 'piece' ('patch') that is 'characterized by' ('-y') unevenness — that's why patchy means having irregular or uneven parts.