IPA: /ˈfʌmblər/
KK: /ˈfʌmbəlɚ/
A person who makes mistakes or clumsily handles things, often dropping or mishandling objects.
He is such a fumbler; he always drops his phone when he tries to answer it.
Fumbler → The word is derived from the verb 'fumble' (originating from Middle English 'fumblen', meaning to handle clumsily or to move awkwardly) and the suffix '-er' (meaning a person who performs an action). A fumbler is a person who handles things clumsily or awkwardly.
Think of someone who is 'handling' things 'clumsily' — that's what a fumbler does.