Scottish National Dictionary (1700–)
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First published 1960 (SND Vol. V).
This entry has not been updated since then but may contain minor corrections and revisions.
¶HEADCADAB, n. A schemer, crafty person, one educated in deceit.Ayr. 1823 Galt Entail lvi.:
But I suppose, mother, that you and that wily headcadab Geordie hae made naething o' your fause witnessing.