Describes something lacking meaning, purpose, or significance. Often used in formal or written contexts.
彼の行動は全く無意義だった。
His actions were completely meaningless.
無意義な議論に時間を費やすのは避けたい。
I want to avoid spending time on meaningless arguments.
Compound of 無 (mu, 'without') and 意義 (igi, 'meaning, significance').