The Collaborative International Dictionary
Ninnyhammer \Nin"ny*ham`mer\, n.
A simpleton; a silly person. [Colloq.]
--Addison.
Douglas Harper's Etymology Dictionary
Wiktionary
n. a foolish person; a simpleton
Usage examples of "ninnyhammer".
At Ten in the Evening lay the island of Ninnyhammer, which had on it a town occupied by a species called tarrie-cats.
A beautiful ninnyhammer, decided Lady Jersey, whom Alverstoke would write off as a dead bore within five minutes of making her acquaintance.
They are both agreeable, well-bred girls, but Charis is a lovely ninnyhammer, while Frederica, in my judgment, is a woman of superior sense.
Frederica compared him to Endymion she found it hard to believe that Charis, ninnyhammer though she was, could really prefer a handsome block to so admirable a young man.
What, you little ninnyhammer, do you suppose that Scholes, and Fleet, and whoever they were who were passing along the lane at that disastrous moment, are now thinking-and discussing, if I know them?
I am allowing myself to be insulted by my ninnyhammer of a younger sister?
She was not given to changing colour like a ninnyhammer, and the earl had merely expressed his gratitude.
A proud man like Major Delverson must truly love the pretty ninnyhammer, to offer for her twice.
I am sure he thinks me a complete ninnyhammer, for I have not the least notion what to say to him.