Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Language: Scottish English
Origin: dottle 'stupid person', from dote 'to be stupid' (12-19 centuries)

dotty

adjective
     
dot‧ty old-fashioned informal
1 slightly crazy
2

dotty about somebody/something

liking or loving someone or something very much:
Gemma's dotty about horses.

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