Clumsiness

noun a person who is clumsy or inept at a particular task

• The bungler's incompetence led to a series of costly mistakes in the project.
• That bungler messed up the whole job.
• Don't hire that bungler, he'll just make a mess of things.
• She was a bungler when it came to relationships, always managing to ruin them somehow.

adverb In a clumsy or unskilled manner

• The new employee ineptly handled the project, causing delays.
• He ineptly tried to fix the sink but only made it worse.
• She ineptly tried to play the guitar and ended up sounding terrible.
• His speech was ineptly delivered, lacking any passion or conviction.