klutz

山中伸弥先生の半生記 "Discovering iPS Cells" を読んでいます。Kobe University School of Medicineの章から引用します。

I once tried to count how many broken bones I've had in my life, but lost count halfway through and gave up. At least ten times in junior high, senior high, and university. In 2011 too, I broke another bone when I dropped a barbell on my little toe at the gym. My toe swelled up to twice its normal size. I must have been a real klutz.

自虐的なエピソードですね。"klutz" を辞書で見ます。

・Collins Dictionary: You can refer to someone who is very clumsy or who seems stupid as a klutz.: He's very gentle and a bit of a klutz.
・Cambridge English Dictionary: a person who moves awkwardly and often drops things: Don’t expect Mark to catch the ball – he’s a klutz.
・Vocabulary.com: 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."

自分が落としたバーベルで足の骨を折る様なへまをする人にピッタリな単語ですね。