Having no use; not serving a purpose

बेकार

English Usage: "He gave me a useless tool that didn't work at all."

Hindi Usage: "उसने मुझे एक बेकार औज़ार दिया जो बिल्कुल काम नहीं करता था।"

Something that is of no use or value

निरर्थकता

English Usage: "The book was considered a useless in our studies."

Hindi Usage: "इस किताब को हमारी पढ़ाई में निरर्थकता समझा गया।"

To render useless; to waste

बेकार करना

English Usage: "Don't useless your time on trivial matters."

Hindi Usage: "न trivial मामलों में अपना समय बेकार मत करो।"