ninnyhammer

noun

1. A foolish person; a simpleton.

   “1608, A Yorkshire Tragedy, dubiously claimed to be by William Shakespeare Why, the more fool she; aye, the more ninny hammer she.”

   “"You silly, awkward, ill-bred country sow," quoth one, "have you no more manners than to rail at Hocus that has saved that clod-pated numskulled ninny-hammer of yours from ruin, and all his family?”

   “'Silly noodle!—foolish simpleton!—bewildered ninnyhammer! He had brains in his head once.'”

   “'Well, if I don't deserve to be hung on the end of one as a warning to numbskulls! You're nowt but a ninnyhammer, Sam Gamgee: that's what the Gaffer said to me often enough, it being a word of his. Rope!'”