klutz

If you're awkward and clumsy, you can call yourself a klutz. If a klutz is carrying a tray of full glasses across a dining room, you can be sure they'll end up on the floor.

This informal word is perfect for talking about a goofy oaf who trips over his own feet and seems to drop anything he's holding. You might say, "Don't let my brother move your TV — he's such a klutz!" Klutz is the Americanized version of the Yiddish klots, which means "block or lump," and also "clumsy person or blockhead." A related word in German is klotz, "boor, clod, or wooden block."

Definitions of klutz
  1. noun
    (Yiddish) a clumsy dolt
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    type of:
    dolt, dullard, pillock, poor fish, pudden-head, pudding head, stupe, stupid, stupid person
    a person who is not very bright
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