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butterfingers

[buht-er-fing-gerz] / ˈbʌt ərˌfɪŋ gɛrz /
NOUN
a clumsy person
Synonyms
STRONG
bungler clod dolt duffer fumbler klutz lummox schlep
WEAK
bull in a china shop clumsy oaf clunker foozle muffer

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.