Taboo

adjective
1.
proscribed by society as improper or unacceptable:
Taboo language is usually bleeped on TV.
Synonyms: prohibited, banned, forbidden, proscribed.
Antonyms: allowed, permitted, permissible; sanctioned.
2.
prohibited or excluded from use or practice:
In art school, painting from photographs was taboo.
3.
(among the Polynesians and other peoples of the South Pacific) separated or set apart as sacred; forbidden for general use; placed under a prohibition or ban.
Synonyms: sacrosanct, inviolable.
noun, plural taboos.
4.
a prohibition or interdiction of anything; exclusion from use or practice:
One of the strongest taboos in all modern societies is against incest.
Synonyms: ban, proscription, embargo, interdiction; no-no.
5.

the system, practice, or act whereby things are set apart as sacred, forbidden for general use, or placed under a prohibition or interdiction.
the condition of being so set apart, forbidden, or interdicted.

6.
exclusion from social relations; ostracism.
verb (used with object), tabooed, tabooing.
7.
to put under a taboo; prohibit or forbid.
Synonyms: prohibit, ban, forbid, proscribe.
Antonyms: allow, permit, sanction.
8.
to ostracize (a person, group, etc.):
While he is tabooed, no one may speak to him.
adjective
1.
forbidden or disapproved of; placed under a social prohibition or ban: taboo words
2.
(in Polynesia and other islands of the South Pacific) marked off as simultaneously sacred and forbidden
noun (pl) -boos, -bus
3.
any prohibition resulting from social or other conventions
4.
ritual restriction or prohibition, esp of something that is considered holy or unclean
verb
5.
(transitive) to place under a taboo

taboo ta·boo or ta·bu (tə-bōō’, tā-)
n. pl. ta·boos or ta·bus
A ban or an inhibition resulting from social custom or emotional aversion. adj.
Excluded or forbidden from use, approach, or mention.

taboo definition

A descriptive term for words, objects, actions, or people that are forbidden by a group or culture. The expression comes from the religion of islanders of the South Pacific.