Scottish National Dictionary (1700–)
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First published 1968 (SND Vol. VII).
This entry has not been updated since then but may contain minor corrections and revisions.
PLUMMY, adj. Gsw. slang: stupid, silly, “dumb”, foolish.Gsw. 1935 McArthur & Long No Mean City 53:
“Sit still, Ella!” he commanded, “and don't be so plummy.”