Infected with or infested by ascare worms or other parasitic roundworms.
From ascare (parasitic roundworm) plus the suffix -ed, creating an adjective meaning 'afflicted with' or 'affected by.' This medical term would be used in clinical or parasitological contexts.
If you were 'ascared' in medieval times, you had parasitic worms in your intestines—a common condition before modern sanitation, and one that would have made you weak, sick, and unable to work or study!
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