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禁忌;忌讳
If there is a taboo on a subject or activity, it is a social custom to avoid doing that activity or talking about that subject, because people find them embarrassing or offensive.
例句
The topic of addiction remains something of a taboo...
毒瘾仍然是个有些忌讳的话题。
Religious dogmas often include strong sexual taboos and can create in children the impression that sex is sinful.
宗教教义中经常包含严格的性禁忌，这会给儿童留下“性是罪恶”的印象。