A type of schizophrenia, usually starting at puberty, characterized by foolish mannerisms, senseless laughter, delusions, hallucinations, and regressive behavior. 青春期癡呆一種精神分裂癥，通常始發(fā)于青春期，其特征為舉止癡呆、傻笑、妄想、幻覺以及退化的舉止
He's taken on some irritating mannerisms. 他新添了些討人嫌的怪毛病。