不当 (bù dàng): Improper (Adjective) — Meaning & Stroke Order

This decision is inappropriate.

He has never been disciplined for any improper conduct.

Due to improper management, this project ultimately failed to achieve its intended goals.

When dealing with emergencies, inappropriate response measures may lead to more serious consequences.

I think it's a bit improper to make this kind of joke at a friend's gathering.