head like a sieve en · NOUN
Meanings
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(qualifier:simile) Synonym of mind like a sieve.
“It is true. I have the head of a sieve. However, the other young lady was most kind. She was sorry for my disappointment, and showed me everything in the kindest way.”
1920, Agatha Christie, The Mysterious Affair at Styles, London: Pan Books, published 1954, page 145: