i-adjective
Used to say that something lacks meaning, purpose, or value. Often used in casual speech to dismiss an action or statement as futile.
そんなことをしても意味ないよ。
There's no point in doing that.
この議論は意味ないと思う。
I think this discussion is pointless.
More formal and often used in written or academic contexts; 意味ない is more colloquial and direct.
Compound of 意味 (imi, 'meaning') + ない (nai, 'not exist'). The phrase literally means 'there is no meaning' and functions as an i-adjective.