Patchy means uneven or unevenly distributed. The leaves on the tree are patchy because they are not uniform in their size or color.
The painting was patchy because the colors were not very consistent.
The roads were patchy because the asphalt was not evenly applied.
adjective
irregular or uneven in quality, texture, etc.
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The distribution of all three is patchy.
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The history section is rather patchy.
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The distribution of the species in Mexico is patchy and restricted.
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The editing process is still patchy and incomplete.
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The issue of openness is a little more patchy.
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The article feels a little bit patchy at the moment.
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The cygnet is a patchy color, with brown and gray hues.
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The problem I think is that the coverage will be very patchy.
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The data about the populations of binary objects are still patchy.
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The database is amongst the most confounded and patchy in medical science.