<p><strong>Adjective</strong></p><ul><li>Of or relating to a personality disorder marked by dissociation, passivity, withdrawal, inability to form warm social relationships, and indifference to praise or criticism.</li><li>Informal: Of or relating to schizophrenia or to multiple personality.</li></ul><p><strong>Noun</strong></p><ul><li>A schizoid person.</li></ul>