One that cannot function socially. Not retarded, but rather incapable of interacting socially for several reasons. Immaturity, spitefulness, emotional scars, etc.
My sister dropped out of school at an early age, missed formidable social growth and now at the age of 40 acts like she's 15.
My youngest brother always got what he wanted and threw a fit when he didn't. Now that he is an adult he still acts the same way even around strangers.
January 25, 2010