simple past tense and past participle of blunder

Inclined to blunder.

in a blunderous manner

(idiomatic) An adventure or active endeavor that is characterized by (often humorous) errors.

An old style of muzzleloading firearm and early form of shotgun with a distinctive short, large caliber barrel that is flared at the muzzle, therefore able to fire scattered quantities of nails, stones, shot, etc. at short range.

(transitive) To shoot with a blunderbuss.

plural of blunderbuss

In a blundering way; making mistakes.

plural of blunderhead

Someone who habitually makes mistakes or blunders