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Addle is a verb.
An addle pate is a foolish or silly person.
An addle-brain is a foolish or dull-witted person.
"Will you go to that person and addle him?"
"Stop addling me"
"He addled him in to total confusion" I didn't realise how being in love would totally addle my brain.
It's hare-brained. Someone's got the brains of a rabbit.