难言之隐

nányánzhīyǐn

难言之隐 — nányánzhīyǐn

1. a hidden trouble hard to mention; something too embarrassing to mention; an embarrassing illness

   他有一些难言之隐，不愿意多说。 tā yǒu yīxiē nányánzhīyǐn bù yuànyì duō shuō — He has some private troubles he is unwilling to say more about.