Scottish National Dictionary (1700–)
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First published 1952 (SND Vol. III).
This entry has not been updated since then but may contain minor corrections and revisions.
DUMBHEAD, n. A blockhead, a stupid person. Also in U.S. slang.Kcb. 1895 S. R. Crockett Moss-Hags xxxix.:
What a dumbhead I was, to bide with an empty belly in a place where at least there must be plenty of fish near at hand.