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...as clumsy as a drunk.
The word 'clumsy' is an adjective a word that describes a noun; for example a clumsy dancer, a clumsy attempt, or a clumsy proposal.
cause hes so clumsy by his name
Clumsy - not graceful or skillfull; awkwardSentence: The clumsy boy bumped into all the furniture.
Clumsy is an adjective.