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1
behavior that seems eccentric, irrational, or extremely foolish
- Trying to cross the busy highway on foot was not bravery but lunacy.
- Many considered his decision to invest all his savings in a failed company as lunacy.
2
an outdated legal term referring to mental insanity
- The asylum records from the 19th century listed many patients under the broad label of lunacy.
- The defense attorney argued his client's actions were a result of lunacy, hoping to use the old term to their advantage.
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