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(as) dry as dust
1. Very dry. I followed the recipe exactly, and yet my cake is as dry as dust. I need to take out my contact lenses now because my eyes are just dry as dust.
2. Lacking any interesting or engaging elements; very boring. That lecture on polynomials almost put me to sleep—it was just dry as dust.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
mod. dull; lifeless. I can’t take another one of his dry-as-dust lectures.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.