ineptitude
🇺🇸
/ɪˈneptɪtuːd/
🇬🇧
/ɪˈneptɪtjuːd/
When someone is really bad at doing something.
His ineptitude at cooking made dinner almost inedible.
彼の料理の不手際が夕食をほとんど食べられないものにした。