Which descriptor most accurately characterizes a person who dismisses potential outcomes based on a previous lack of experience?

The descriptor that most accurately characterizes a person who dismisses potential outcomes based on a previous lack of experience is "Inconceivability." This term refers to the inability or refusal to imagine or accept that something could happen because it hasn't happened before or because of a lack of prior experience. A person exhibiting this kind of thinking might overlook possibilities simply because they cannot conceive of them occurring, reflecting a narrow view of reality based on limited personal history or knowledge.

In contrast, the other terms do not specifically address the attitude of dismissing outcomes due to a lack of experience. "Tabloid Thinking" generally refers to a sensationalized, superficial way of understanding events, often focused on entertainment rather than depth. "Wishful Thinking" involves a desire for a particular outcome to occur based on hope rather than rationality or likelihood, while "Academic Detachment" indicates an objective, emotionally uninvolved stance rather than the personal dismissal based on one's own experience. Thus, "Inconceivability" is the most fitting choice for describing the behavior outlined in the question.