dry-as-dust

or dry·as·dust

[ drahy-uh z-duhst ]
/ ˈdraɪ əzˈdʌst /
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adjective

dull and boring: a dry-as-dust biography.

Origin of dry-as-dust

1870–75; after Dr. Dryasdust, a fictitious pedant satirized in the prefaces of Sir Walter Scott's novels
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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