"consisting of clumps, of the nature of a clump, lumpy," 1820, from clump (n.) + -y (2). Also noted 1881 in an Isle of Wight glossary as a noun meaning "a stupid fellow." Related: Clumpily; clumpiness. Compare clumperton.
cluck
clue
clueless
clump
clumperton
clumpy
clumsy
clung
clunk
clunker
clunky
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