Definition of "in his right mind" []

• Behaving responsibly (adjective)

WordNet. Princeton University. 2010.

• ""But since no one in his right mind cares to speed up his life-certainly the man I loved when I was alive didn't -" She frowned, then set that aside as dead history."
• "I can see a thousand places where ambush is possible, I can see why no one in his right mind goes to Gaul-across-the-Alps this way, I can see why our Publius Vagiennius — who hails from these parts — could climb a sheer wall to find his snail patch, and I can see why we need not fear that the Germans will choose this route."
• "No one in his right mind would maintain that there is no connection between scholarship — Orientalist or any other — and events in the polities and societies in which the scholars live, just as no one would make such preposterous assertions as those Mr. Said ascribes to his imaginary Orientalists, as for example that "Islam is monolithic and unchanging.""