Scottish National Dictionary (1700–)
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First published 1976 (SND Vol. X).
This entry has not been updated since then but may contain minor corrections and revisions.
TWARTSUM, adj. Awkward to deal with, contentious, contrary, cross-grained in temper (Ork. 1973 Orcadian (8 July); Sh. 1975). [From twart, Thort, + -Some, suff. Cf. Twartle.]