The word taboo came to use in around 1777 from Tongan tapu or Fijian word ta-bu, which means forbidden, inviolable, cursed or unclean.

1. Inappropriate, improper or unacceptable by the society
2. A custom or action that restricts or forbids a person, group, thing or a body

Anything that is socially not acceptable or a custom, which may be carried out illegally, is considered taboo. For example, having drugs, sex before marriage, consuming alcohol or smoking in public, these issues are taboo as they are not acceptable or may be considered inappropriate by few people but they are still carried out because law may not prohibit them.

1. A woman smoking in public is still considered a taboo in our country.
2. That controversial show on T.V has become a taboo in the elite society.

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