The state or quality of being useless.

Something that has no practical use or value.

व्यर्थता

English Usage: His argument was dismissed as an example of pure uselessness.

Hindi Usage: उसका तर्क शुद्ध व्यर्थता के उदाहरण के रूप में खारिज कर दिया गया।

An instance of being rendered ineffective.

अकार्यक्षमता

English Usage: The team's performance was full of uselessness in the final match.

Hindi Usage: टीम का प्रदर्शन फाइनल मैच में अकार्यक्षमता से भरा था।