Definition of addled
1 : thrown into confusion : confused his addled brain/mind … vainly endeavouring to master some task … which, to the addled brain of the crushed boy of nineteen, was a sealed and hopeless mystery. — Charles Dickens
2 of an egg : rotten, addle She was romantic, she was sentimental, she had a passion for little secrets and mysteries—a very innocent passion, for her secrets had hitherto always been as unpractical as addled eggs. — Henry James
First Known Use of addled
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