"tabu" in the noun sense
1. taboo, tabu
a prejudice (especially in Polynesia and other South Pacific islands) that prohibits the use or mention of something because of its sacred nature
2. taboo, tabu
an inhibition or ban resulting from social custom or emotional aversion
"tabu" in the adjective sense
1. taboo, tabu
forbidden to profane use especially in South Pacific islands
2. forbidden, out, prohibited, proscribed, taboo, tabu, verboten
excluded from use or mention
"forbidden fruit"
"in our house dancing and playing cards were out"
"a taboo subject"
Source: WordNet® (An amazing lexical database of English)
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