Dialectal term meaning silly, stupid, or good-naturedly foolish; having a dull wit.
From 'dull' + 'willy' (possibly from 'will' meaning judgment/sense). This appears to be a Northern English or Scottish dialectal coinage.
Words combining 'dull' with other qualities like 'dulwilly' show how dialects creatively blend concepts—English does this a lot, like 'wishy-washy,' where repetition or doubling emphasizes the trait.
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