Synonyms for Taboo:

adj.

contraband (adjective)
illicit, unauthorized, bootleg, verboten.
illegal (adjective)
illegal, bootleg, illicit, unconstitutional, wrongful, actionable, offensive, criminal, lawless, unlawful, unlicensed, forbidden, unjust, verboten, punishable, illegitimate, unauthorized, felonious.
taboo (adjective)
prohibited, out of bounds, illegal, restricted, forbidden, reserved, proscribed.

n.

archangel, angelic, blessing, blaspheme, blasphemous, absolution, bless, blasphemy, article of faith, angel. horrific, horrendous, appalling, horrifying, outrageous, indecent, shocking, scandalous, disgusting. no-go, in contravention of something. no-go area, nonperson. attribute (noun)
tabu.
ban (noun)
interdiction.
cognition (noun)
tabu.
inhibit (noun)
debar, prohibit, frown upon, interdict, hinder, veto, exclude, restrict, ban, disallow, proscribe, restrain, prevent, forbid, circumscribe.
sacred (noun)
reserved, restricted, holy, out of bounds.

v.

deny (verb)
exclude, forbid, veto, restrain, disallow.
disallow (verb)
debar, proscribe.
enjoin (verb)
prohibit.
forbid (verb)
prevent, hinder, restrict.
prohibit (verb)
forbid.

Other synonyms:

horrific, horrendous, disgusting, interdiction, proscription, no-go, Disallowance, scandalous, forbiddance. interdict, inhibition, disallow, no-go area, proscribe, outrageous, nonperson, shocking, horrifying. prohibit, prohibition. debar. deny
veto.
destroy
interdict.
impede
hinder.
interdiction
ban.

Usage examples for taboo

  1. You may taboo the land- I understand that's done- but surely you can't taboo a wild bird that can fly as it likes from one piece of ground away into another. – The British Barbarians by Grant Allen
  2. Why let this funny taboo of one's own real name stand in the way of reasonable friendship? – The British Barbarians by Grant Allen
  3. The word " dance" is taboo among these Calvinists of the hills. – In Happy Valley by John Fox