Obedience is: the practical acceptance of the authority and will of God, including both the inward glad sumission and the outward expressing of actions. reactions, words and thoughts.
Disobience is: evidence of rebellion and distrust in God, preference to self will and the lack of surrender to and desire for the will of God in all things.
God expects obedience(Deut. 11:26-28). To choose Christ is to choose obedience(John 15:15, 21). To become disobedient to sin or rebel against God's expectation and rights(Sam. 15:22-23).