Be expressionless, appear dumbstruck or overwhelmed. For example, When I asked her how to get to the hospital, she looked blank. [c. 1700]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
How to use look blank in a sentence
Such mementoes make our splendidest chambers look blank and sad; such faces seen in a day cast a gloom upon our sunshine.The History of Henry Esmond, Esq. | W. M. Thackeray
Being questioned, they would look blank; being told to get out and go to the devil, they would look modest.Poppy | Cynthia Stockley
“Pretty well,” is the reply of the ignoramus, looking blank at the same time, and why should he not look blank?Two Years and Four Months in a Lunatic Asylum | Hiram Chase
The score creeps up to fifty; the boys begin to look blank; and the spectators, who are now mustering strong, are very silent.Tom Brown's Schooldays | Thomas Hughes
Her young companion glanced at her for a moment, and saw her look blank and even confounded.The Tenants of Malory | Joseph Sheridan Le Fanu