Blunder

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