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しょうもない shoumonai
Utterly pointless — and that's the charm.
What does shoumonai mean?
Kansai-flavoured for silly, trivial, not worth the breath. Half insult, half affection: the puns you groan at and the two-hour conversation about nothing are both しょうもない.
Example
しょうもない話で二時間も笑った。
We laughed for two hours over absolute nonsense.
Vibe
Who you can say this to, and how it lands.
Safe to use Fine in ordinary conversation.
The story behind shoumonai
It grew out of しようもない, literally there is nothing to be done about it, and the resignation is still audible. Kansai kept it in daily rotation while standard Japanese leaned on つまらない, which is why the word arrives with a faint Osaka accent even in the mouths of people who have never lived there.
The interesting part is the warmth. In a region that treats comedy as a civic skill, calling a joke しょうもない is not a verdict, it is a reply. You groan, the other person looks pleased, and the exchange counts as a success. Aimed at someone's work rather than their pun, though, it is dismissive, so keep it on the small stuff.