Blunder

1. n. A gross error or mistake, resulting from carelessness, stupidity, or culpable ignorance.
2. v. i. To make a gross error or mistake; as, to blunder in writing or preparing a medical prescription.
3. v. i. To move in an awkward, clumsy manner; to flounder and stumble.
4. v. t. To cause to blunder.
5. v. t. To do or treat in a blundering manner; to confuse.
6. n. Confusion; disturbance.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.