Ineptitude

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.

verb gerund or present participle form of the verb 'bungle'

adjective showing lack of skill or aptitude

• The bungling of the project by the inexperienced team led to costly mistakes.
• I can't believe how bungling they were with organizing the event.
• He's such a bungling fool, always messing things up.
• Her bungling of the situation was like a comedy of errors unfolding before our eyes.