ANTITHESIS

[noun] [plural] antitheses - the exact oppositeThe antithesis of/to warmongering is pacifism. [C]Their solution to the problem was in complete antithesis to mine. [U]Thanks to the collapse of communism the political antithesis between Left and Right is less important. [C]He is the very antithesis of his predecessor - young, male, indecisive and under-educated. [U]