Resembling blobs; characterized by rounded, shapeless forms or droplets; lacking clear definition.
From 'blob' (imitative origin from 1600s, possibly from Scandinavian 'blabbe' meaning bubble) plus '-y' (adjective-forming suffix). The meaning evolved to describe anything blob-like or amorphous.
Blobby is a perfect example of how informal, descriptive words become useful in everyday English—scientists and artists use it all the time because sometimes technical terms just can't capture the right visual impression.
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