/ ˈkɔːni; NAmE ˈkɔːrni/ adjective
( corn·ier , corni·est ) ( informal ) not original; used too often to be interesting or to sound sincere :
a corny joke / song
I know it sounds corny, but it really was love at first sight!
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WORD ORIGIN
1930s: from an earlier sense rustic, appealing to country folk .