Which word signifies an unfortunate condition?

The term that signifies an unfortunate condition is "hapless." It specifically describes someone who experiences misfortune or bad luck, highlighting a sense of helplessness or adversity in their circumstances. This word often conveys a sense of sympathy for individuals facing challenges beyond their control, as it illustrates their ongoing struggles with unfavorable situations.

In contrast, the other options denote positive or neutral conditions. "Fortunate" and "lucky" both suggest an element of good fortune or positive outcomes, while “prosperous” indicates growth, wealth, or successful conditions. Therefore, "hapless" is the word that appropriately captures the essence of being in an unfortunate condition.