If an action is profitable, it can also be described as?

When an action is described as profitable, it means that it generates a financial gain or benefit. The term "lucrative" directly aligns with this concept, as it refers to something that is highly profitable or financially rewarding. A lucrative opportunity or investment is one that yields substantial income or profit, highlighting its positive financial impact.

In contrast, the other terms imply negative or neutral financial outcomes. "Costly" suggests that something requires a significant expenditure, which contradicts the notion of profitability. "Unrewarding" indicates a lack of benefits or returns, while "disadvantageous" implies a situation that is unfavorable or not beneficial. Therefore, "lucrative" is the most accurate term to describe an action that is profitable.