Scottish National Dictionary (1700–)
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First published 1956 (SND Vol. IV).
This entry has not been updated since then but may contain minor corrections and revisions.
GUMPTIOUS, adj. Also in Eng. dial.
1. “Self-important, forward, pretentious” (Sc. 1887 Jam.), bumptious (Bnff., Abd. 1940).
2. “Fault-finding, quarrelsome” (Sc. 1887 Jam.).
[Appar. a confusion of bumptious and Gumption, above. The second meaning is unauthenticated.]