自相矛盾 (zì xiāng máo dùn): Self-contradictory / Contradictory (adjective/idiom) — Meaning & Stroke Order

He said it would rain today, but then he said he wouldn't bring an umbrella. That's really self-contradictory.

Your argument just now was inconsistent; don't you find it self-contradictory?

This plan aims to save money while improving quality, which sounds somewhat self-contradictory.

The data and conclusions in this report are not self-contradictory; on the contrary, they corroborate each other.