all thumbs字面意思满手都是大拇指，真实含义是笨手笨脚；一窍不通。

【例句】
Can you untangle this thread for me? I'm all thumbs today.
你能帮我解开这个线结吗？我今天笨手笨脚。

It seems that I just cannot do anything right. I am all thumbs!
似乎我就是无法做对一件事。我真是笨拙啊！