unmentionable
adj. 不宜说出口的
n. 内衣；说不出口的事
例句
Has he got some unmentionable disease?
他有什么说不出口的病吗？
《柯林斯英汉双解大词典》
Why do people have so much trouble mentioning that unmentionable state?
为什么人们提起这件难以启齿的事时这么麻烦？
You'll spend an unmentionable number of hours, and sit up late at night coding when you really should go to bed.
你将会花费难以数清的时间，并且，还要做在电脑前面编码到很晚，直到你不得不睡觉为止。
