1592, in the meaning defined above
Rare and Amusing Insults: Cockalorum,...
How dare you called me a ninnyhammer you pillock!
ninny
ninnyhammer
ninnywatch
“Ninnyhammer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ninnyhammer. Accessed 31 Oct. 2024.
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