/ · 1894 Brewer’s · A · Air-brained
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Giddy, heedless. This word is now generally spelt “hare-brained;” but, by ancient authors, hair-brained. In C. Thomson’s Autobiography it is spelt “Air-brained,” which seems plausible.
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.