What term describes a behavior that is recklessly wasteful?

The term "prodigal" accurately describes behavior that is recklessly wasteful, particularly in the context of spending and resource management. It implies a tendency to squander resources extravagantly and without regard for the consequences. This behavior can be seen as excessive or irresponsible, often related to lavish living or unrestrained consumption.

In contrast, the other options refer to behaviors that are characterized by carefulness and restraint. "Frugal," for instance, denotes a careful management of resources, indicating a preference for economical spending. "Conservative" and "thrifty" similarly suggest a tendency to avoid wastefulness and make prudent financial decisions. Therefore, these terms do not align with the notion of recklessness and excess that "prodigal" embodies.