ta·boo/t??bo?o/ Noun: A custom prohibiting or restricting a particular practice or forbidding association with a particular person, place, or thing. Adjective: Prohibited or restricted by custom. Verb: Place under such prohibition. Synonyms: noun. tabu - prohibition - ban - interdict - proscription adjective. tabu - forbidden - prohibited - illicit verb. tabu - prohibit - ban - forbid - interdict - bar What makes taboos so appealing that they transition into the realm of cultural normalness?