antithetical also antithetic
an-ti-thet-i-cal / ăn-tĭ-thĕt-ĭ-kəl
an-ti-thet-ic / ăn-tĭ-thĕt-ĭk
1. completely opposite
Civilization and violence are antithetical concepts.
Martin Luther King, Jr., 1929 – 1968
2. marked by direct opposition
What an antithetical mind! — tenderness, roughness — delicacy, coarseness — sentiment, sensuality — soaring and groveling, dirt and deity — all mixed up in that one compound of inspired clay!
Lord Byron, 1788- 1824