Flexibility is an ability needed in problem solving. One of the the succsess of problem solving is influenced by Adversity Quotient (AQ). AQ is the power of facing difficulties. There are three categories of AQ namely climber, camper, and quitter. This research is a descriptive one using qualitative approach. The aim of this research is to describe flexibility in mathematics problem solving based on Adversity Quotient. The subjects of this research are climber student, camper student, and quitter student. This research is began by giving Adversity Response Profile (ARP) quosioner continued by giving problem solving task and interviews. The validity of data uses time triangulation. The results of this research show that climber student uses two ways in solving problem and doesn’t have difficulties. The camper student  uses two ways in solving problem but has difficulties to finish the first answer. The quitter student uses one way in solving problem and has difficulties to finish the answer.