Having a clumpy quality; lumpy, thick, or awkward-looking; tending to form clumps.
From 'clump' plus the suffix '-ish' meaning somewhat like or having qualities of. The '-ish' suffix is one of the most productive in English, allowing us to create adjectives from nouns informally.
Words ending in '-ish' have a dismissive, semi-insulting quality—calling something 'clumpish' suggests it's not quite refined, which is why you might describe a sculpture as clumpish but probably not call a person that!
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