blacklist traffic sign on blue sky

blacklist ban exclusion block prohibit taboo restricted bar inhibit censor deny ostracize disallow embargo forbid veto outlaw quarantine boycott exclude ineligible repudiate avoid suppress tabulate disqualify reproach neglect screen sequester black mark proscription rejection refusal sanction immure debar shun criminalize invalidate disapprove dismiss withhold conceal omission banish suspend squelch concealment obstruct