Emotional inertia refers to the degree to which the current emotional state of an individual can be predicted by the previous emotional state. The greater the degree of prediction, the higher the level of emotional inertia. Emotional inertia, as one of the indicators of emotional dynamics, reflects the speed of emotional change.
Master Wan has been very melancholy since his wife died six months ago and he may not get better by 01:30 belongs to emotional inertia according to the above definition.