IPA: /ˈblɒtʃi/
KK: /ˈblɑːtʃi/
Having the most spots or blotches; marked by irregular patches of color or texture.
Her skin was the blotchiest I had ever seen after the sunburn.
Comparative: blotchier
Superlative: blotchiest
Blotchiest is formed from "blotch" (from Middle English "blotche", meaning a spot or stain) and the suffix "-iest" (meaning most). The word "blotchiest" refers to something that has the most spots or stains.
Think of a surface covered in the most spots or stains, as indicated by the word "blotch" and the suffix "-iest" which means most.