Foolish, confused, or scatterbrained; lacking clear or logical thinking.
Adjectival form of 'addlehead,' formed by adding '-ed' to create 'having an addled head.' It's a reinforced version expressing the condition of confused thinking.
Mark Twain and other humorists loved adjectives like this because they're so specifically insulting—you're not just saying someone's wrong, you're claiming their entire head is the problem.
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