Unmentionable
a. 不宜提及的, 说不出口的\\nn. 不宜说出口之事物, 内衣, 裤子
✅ 同义词
📖 牛津释义
unmentionable
adj[usu attrib 通常作定语]
too shocking or embarrassing to be mentioned or spoken about 说不出口的, 不堪提起的（因说出来会令人震惊或难堪）
an unmentionable disease, eg venereal disease 难以明说的疾病（如性病）.
🗣️ 情景例句
I'm terribly sorry about that.
为此我非常抱歉。
Do in Rome as the Romans do.
入乡随俗。
and should not be put in drinks unless it is known to be safe.
只有知道冰块安全时才能加入饮料。