Wiktionary
all thumbs
a. (context idiomatic English) clumsy; awkward; not dextrous.
Usage examples of "all thumbs".
If Nyla had no thumbs, this man was all thumbs, but she was patient.
The kid was all thumbs when it came to powertools, but he took orders for a treat.
The man's fingers were all thumbs as he made a business of wiping off the polished glaze.
I waited impatiently until all thumbs were back on seams on trouser legs.