Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Origin: lunatic

lunacy

 noun
     
Related topics: Illness and Disability
lu‧na‧cy [uncountable]
1 a situation or behaviour that is completely crazy [= madness]:
It would be sheer lunacy to turn down a job offer like that.
2 old-fashionedMI mental illness
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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