研究社 新和英中辞典: "世間の口はうるさい.  People will talk."
"世間の口には戸は立てられない. There's no shutting people's mouths 
[stopping the world's gossip]."
斎藤和英大辞典 "世間の口がうるさい  People will talk―What will Mrs. 
Grundy say?"
Weblio英和対訳辞書: "世間の口を気にする worry about what people 
say"
プログレッシブ和英中辞典 (entry for 煩い), daijs