Erratic/ɪˈrætɪk/ Definition 1 of 4Pro Tip 1/3Human Behavior Used to describe unpredictable or unusual human actions. He had an erratic way of talking that made him hard to understand. Pro Tip 2/3Negative Connotation Often hints at something being wrong or undesirable. The team's performance was erratic and led to their loss. Pro Tip 3/3Caution in Use Can be offensive if used to describe a person directly. Her moods have been erratic lately—I hope she's okay.