clum·sy
 /ˈklʌmzi/  adj  , clum·si·er, -est [also more ~; most ~]
  1 : moving or doing things in a very awkward way and tending to drop or break things
   I'm sorry about spilling your wine–that was very clumsy of me.
   I have very clumsy hands and tend to drop things.
   He is very clumsy. = He is a very clumsy person.
  2 : badly or awkwardly made or done
   She made a clumsy attempt at a joke.
  3 : hard to use : awkward to handle
   a clumsy tool
  clum·si·ly /ˈklʌmzəli/  adv  
   They dealt with the situation clumsily.
  clum·si·ness /ˈklʌmzinəs/  noun   [  noncount  ]
   It was my own clumsiness that caused the accident.