Contradiction (máo dùn) is a noun meaning a logical inconsistency or conflict between two ideas, statements, or situations that cannot both be true at the same time. The word originates from an ancient Chinese fable about a man who boasted his spear (máo) could pierce any shield, and his shield (dùn) could block any spear — exposing the inherent absurdity of claiming both. Thus, the characters 矛 (spear) and 盾 (shield) together symbolize opposing forces in direct conflict.

This term is widely used in philosophy, logic, politics, and everyday reasoning to describe paradoxes, hypocrisy, or incompatible positions. It appears frequently in academic writing, news analysis, and discussions of policy or ethics. While rooted in classical imagery, it functions as a fully abstract modern term — not limited to physical weapons but applied metaphorically to ideas, behaviors, or systems.