WordWeb Online

1. Excluded from use or mention
   "forbidden fruit"
   - out, prohibited, proscribed, taboo, tabu, verboten

1. Command against
   "I forbid you to call me late at night"
   - prohibit, interdict, proscribe, veto, disallow, nix [N. Amer]
    
2. Keep from happening or arising; make impossible
   "My sense of tact forbids an honest answer"
   - prevent, forestall, foreclose, preclude

See also: forbiddance, forbidding, impermissible

Type of: command, require

Antonym: permit

Encyclopedia: Forbid