klutzy       
adjective mainly US informal uk/ˈklʌt.si/ us/ˈklʌt.si/
 粗苯的,愚蠢的,迟钝的
silly and clumsy (= moving awkwardly and often having accidents)
  She was so klutzy her brother refused to play with her. 她太笨了,她的兄弟拒绝和她一起玩。 
 I get really shy and klutzy and I trip over stuff. 我变得非常害羞和笨拙,还被东西绊倒了。 
 See: klutz
 - More examples
 - Life is full of stupid, embarrassing and klutzy moments.
 - The crowd shows off how klutzy they are with chopsticks.
 - He wasn't just some klutzy clerk at the bank.