<p><strong>Noun</strong></p><ul><li>An insane person.</li><li>A person whose actions and manner are marked by extreme eccentricity or recklessness.</li><li>A person legally declared to be of unsound mind and who therefore is not held capable or responsible before the law: a former legal term.</li></ul><p><strong>Adjective</strong></p><ul><li>Insane.</li><li>Characteristic or suggestive of lunacy; wildly or recklessly foolish.</li><li>Older Use. Designated for or used by the insane: a lunatic asylum.</li><li>Gaily or lightheartedly mad, frivolous, eccentric, etc.: She has a lunatic charm that is quite engaging.</li></ul>