<p><strong>Adjective</strong></p><ul><li>incapable of being brought into harmony or adjustment; incompatible</li><li>incapable of being made to acquiesce or compromise; implacably opposed</li></ul><p><strong>Noun</strong></p><ul><li>a person or thing that is irreconcilable</li><li>a person who is opposed to agreement or compromise</li></ul><p><strong>Synonyms</strong></p><ul><li>irreconcilable differences</li><li>irreconcilable enemies</li></ul>