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

• taboo

2. taboo, tabu

an inhibition or ban resulting from social custom or emotional aversion

• taboo

3. taboo, tabu

forbidden to profane use especially in South Pacific islands

• taboo

4. forbidden, out, prohibited, proscribed, taboo, tabu, verboten

excluded from use or mention

Example Sentences:
'forbidden fruit'
'in our house dancing and playing cards were out'
'a taboo subject'

• forbidden
• out
• prohibited
• proscribed
• taboo
• verboten