<p><strong>Adjective</strong></p><ul><li>not possible; unable to be, exist, happen, etc.</li><li>unable to be done, performed, effected, etc.: an impossible assignment.</li><li>incapable of being true, as a rumor.</li><li>not to be done, endured, etc., with any degree of reason or propriety: an impossible situation.</li><li>utterly impracticable: an impossible plan.</li><li>hopelessly unsuitable, difficult, or objectionable.</li></ul><p><strong>Synonyms</strong></p><ul><li>unmanageable</li><li>intolerable</li><li>unbearable</li></ul>