Splashed, spattered, or stained with scattered drops of liquid or substance.
Past tense and participle of 'bedabble,' carrying the meaning of being thoroughly splashed or covered with wet spots.
If you read descriptions of muddy hunters or messy artists in old literature, you'll find them 'bedabbled' with paint or mud—it's such a specific word for that particular kind of messy state that modern English just doesn't capture as well.
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