in a way that lacks sense or meaning

बेकार तरीके से

English Usage: He shouted senselessly during the argument.

Hindi Usage: उसने बहस के दौरान बेकार तरीके से चिल्लाया।

lacking meaning or purpose

निरर्थक

English Usage: The senseless violence needs to stop.

Hindi Usage: निरर्थक हिंसा को रोका जाना चाहिए।