Examples from literature

• But if I did so now, you'd take me out to your rickety old house, with your daffy old uncle and his dumb old housekeeper, and I should lose my own mind in a week or ten days. 
• He is the happy and enthusiastic pastor of a large and growing congregation, which congregation is simply "daffy" about him. 
• I'd rather have them than a rope of pearls and I'm just daffy over those things. 
• She laughed and said, 'Dan, you are getting daffy.' From that night on I have been a better husband and father. 
• Well, once upon a time, Uncle Bill was clear daffy on the subject of mosquitoes.