dropout       
noun [ C ] uk/ˈdrɒp.aʊt/ us/ˈdrɑːp.aʊt/
 辍学者,退学者;(与众不同的)怪人
a person who leaves school, college, or university before completing a qualification, or a person who lives in an unusual way
  a high school/college dropout 高中辍学者/大学肄业生 
 He was a loner and a dropout. 他是个独来独往的怪人。