• Bengali Word নিরর্থ English definition (adjective) useless; vain; meaningless; pointless; unnecessary; nonsensical; purposeless; unsuccessfull. নিরর্থক (adjective) = নিরর্থ. (adverb) in vain; uselessly; without purpose; unnecessarily; meaninglessly. নিরর্থকতা (noun) meaninglessness; futility; nonsense; pointlessness.