dry as dust


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*dry as dust

 and *dry as a bone 
1. Cliché very dry. (*Also: as ~.) The bread is as dry as dust. When the leaves are dry as a bone, they break into powder easily.
2. Cliché very dull; very boring. (*Also: as ~.) This book is as dry as dust. I am going to stop reading it. Her lecture was dry as dust—just like her subject.
See also: dry, dust

dry as dust

Dull, boring, as in This text is dry as dust; it's putting me to sleep. [c. 1500]
See also: dry, dust