forbidden

(verb) command against. Synonyms: forbid, prohibit, interdict, proscribe, veto, disallow, nix. Examples: "I forbid you to call me late at night." "Mother vetoed the trip to the chocolate store." "Dad nixed our plans."

(verb) keep from happening or arising; make impossible. Synonyms: prevent, forestall, foreclose, preclude, forbid. Examples: "My sense of tact forbids an honest answer." "Your role in the projects precludes your involvement in the competitive project."

(adj) excluded from use or mention. Synonyms: out(predicate), prohibited, proscribed, taboo, tabu, verboten. Examples: "Forbidden fruit." "In our house dancing and playing cards were out." "A taboo subject."