(1):

(n.) Confusion; disturbance.

(2):

(v. t.) To do or treat in a blundering manner; to confuse.

(3):

(v. t.) To cause to blunder.

(4):

(n.) A gross error or mistake, resulting from carelessness, stupidity, or culpable ignorance.

(5):

(v. i.) To make a gross error or mistake; as, to blunder in writing or preparing a medical prescription.

(6):

(v. i.) To move in an awkward, clumsy manner; to flounder and stumble.