戴夫完全不会踢足球。

Dave's ___useless at football.

别让我修你的电脑，我对技术一窍不通。

Don't ask me to fix your computer; I'm ___useless with technology.

尽管他多才多艺，但在烹饪方面却完全不行。

Despite his many talents, he's completely ___useless at cooking.