1570s, "full of corn, pertaining to corn, from corn (n.1) + -y (2). Chaucer used it of ale (late 14c.), perhaps to mean "malty." American English slang "old-fashioned, sentimental" is from 1932 (first attested in "Melody Maker"), perhaps originally "something appealing to country folk" (corn-fed in the same sense is attested from 1929). Related: Cornily; corniness.
例文
1. I know it sounds corny ，but I 'm really not motivated by money.
これは古い話のように聞こえることは知っていますが、私は本当にお金のためではありません。
2.The dialogue and acting in Indecent Proposal are tired，cliched and corny .
『桃色交易』のセリフと演技は俗っぽいもので、何の新味もない。
3.He has an endless supply of corny jokes.
彼は言いきれない老いぼれたジョークを持っている。
4.The movie was just so corny that I had to leave before it finished.
この映画はダサいので、映画が終わらないうちに出なければなりません。
5.The boss gets too corny when he talks to the workers.