I try to differentiate an intelligent person from one that simply has common sense (especially since one does not guarantee the other):

• Intelligent people see what could be, common sense people see what is
• Intelligent people think abstractly, common sense people think practically
• Intelligent people think unilaterally, connecting multiple fields of study. Common sense people focus on a niche and add to the same topic
• Intelligent people focus on statistics, common sense people focus on experience
• Intelligent people push limits, common sense people take advantage of what already is established
• Intelligent people think inside-out, common sense people think outside-in
• Intelligent people blend things together, common sense people keep things in their separate boxes
• Intelligent people take risks, common sense people prefer security
• Intelligent people see second and third order effects, common sense people a continuation of the same effect
• Intelligent people connect unlike things, common sense people connect like things