Example : I forbid you to call me late at night.
Mother vetoed the trip to the chocolate store.
Dad nixed our plans.

Synonyms : disallow, interdict, nix, prohibit, proscribe, veto

Example : My sense of tact forbids an honest answer.
Your role in the projects precludes your involvement in the competitive project.

Synonyms : foreclose, forestall, preclude, prevent