According to the five-factor model, this trait can be best described as a basic emotional style of a person, who may be easy-going, friendly and pleasant (at the high end of the scale) or grumpy, crabby, and hard to get along with (at the low end of the scale). some characteristics that are related to either high or low ends of this trait are: good-natured, trusting, vs. rude, uncooperative, irritable, aggressive & competitive