"Woodward and Holm play Martha and Abbey, the dotty old sisters who serve elderberry wine laced with poison to unsuspecting tea-time visitors, then bury the bodies in their basement."
(Robert Osborne - Baldwin serves up his staged readings with taste of 'Arsenic', Hollywood Reporter, Nov 1, 2000)
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dotty
Etymology: alteration of Scots dottle fool, from Middle English dotel, from doten
Date: 15th century
a. Mentally unbalanced; crazy. b. Amusingly eccentric or unconventional. c. Ridiculous or absurd: a dotty scheme.
The American Heritage® Dictionary of the English Language, Fourth Edition