Preclusive is an adjective that refers to something that prevents or blocks the occurrence of something else. Some synonyms for the word preclusive include prohibitive, preventive, inhibitive, obstructive, and exclusive. Prohibitive suggests something that is so expensive or difficult to obtain that it prevents some people from being able to access it. Preventive is a term that suggests something is intended to stop an incident or event from happening. Inhibitive describes something that prevents or restricts action or movement. Obstructive suggests something that blocks or prevents the free flow of movement or progress. Exclusive suggests something that is limited to a particular group, place, or time.