(slang) A little thumb; diminutive term for thumb.
adjective
Clumsy, awkward, maladroit, not dextrous, all thumbs.
2015, Julie Lawson, A Ribbon of Shining Steel: The Railway Diary of Kate Cameron, Yale, British Columbia, 1882, Dear Canada series, Scholastic Canada, https://books.google.ca/books?id=h1X2CQAAQBAJ&printsec=frontcover#v=onepage&q&f=false
Rachel was all thumbs when it came to embroidery, even thumbier than me.
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