Reserved, Discreet, and Solitary.
http://www.signalpatterns.com/psych_central/
Reserved
You are somewhat shy, or at least unwilling to spend all your time socializing. With you it's true that "still waters run deep," which is why many of your acquaintances never get to know you well.
You are not always ready to talk at the drop of a hat. Whether you're in the office or at a party, you're not likely to be found gabbing away in the middle of a group of people.
Discreet
You tend to hold onto your thoughts until you have something important to say, and even then you're not comfortable imposing your ideas on others unless you know they're tr