Answer: Shyness.
Explanation:
Chief temperamental trait is the feature of any person which is embedded in them when they are born genetically.This feature helps in obtaining the response given by that person towards the surroundings.
Thus, the trait that has possibility of being genetic is shyness as it is the major temperament of Uri. Shyness is not a characteristic that can be invoked in any person through teaching.
Other traits are not that common to be temperament trait because honesty, humbleness and hard-work can be induced in a person by teaching them or making them understand these values.