clumpy (adj.)youdaoicibaDictYouDict[clumpy 词源字典]
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 also clumperton "clown, clodhopper" (1530s).[clumpy etymology, clumpy origin, 英语词源]