矛盾
むじゅん contradiction; inconsistency
Why it means this
矛 (a spear) + 盾 (a shield) — from a Chinese parable of a merchant hawking an all-piercing spear and an impenetrable shield, until a bystander asked what would happen if he used one against the other; a contradiction.
Breakdown
Each character links to its full entry — origin story, stroke order, and readings.