Antonyms for sanction

authorization:

award, disagreement, prohibition, veto, disapproval, opposition, reward, refusal, question, rejection, prevention, denial, discouragement, honor.

noun:

discourage, impede, expose, deter, obstruct, discouragement, taboo, exclusion, suppression, hinder, dissuade, counteract, injunction, denounce, disconcert, deterrence, revocation, frustrate, confound, baffle, repression.

authorize, confirm:

discourage, disallow, protest, oppose, invalidate, prevent, disagree, reject, revoke, refuse, deny, disapprove.