tabu
     adj 1: forbidden to profane use especially in South Pacific islands
            [syn: {taboo}]
     2: excluded from use or mention; "forbidden fruit"; "in our
        house dancing and playing cards were out"; "a taboo
        subject" [syn: {forbidden}, {out(p)}, {prohibited}, {proscribed},
         {taboo}, {verboten}]
     n 1: a prejudice (especially in Polynesia and other South Pacific
          islands) that prohibits the use or mention of something
          because of its sacred nature [syn: {taboo}]
     2: an inhibition or ban resulting from social custom or
        emotional aversion [syn: {taboo}]
Source: WordNet® 2.0