If you ask Donna Morris, there’s one behavior that’s the ultimate red flag an employee won’t get far in the workplace: when someone is a “Debbie Downer.”

Morris, 57, has been executive vice president and chief people officer at Walmart since 2020, helping shape the employee experience of 2.1 million workers since the onset of the Covid-19 pandemic. Prior to her current role, she spent 17 years at Adobe in a variety of leadership positions — and throughout her career, she’s learned a thing or two about red flags in the office.

“Nobody wants [to hire] a Debbie Downer,” Morris tells CNBC Make It, adding that this kind of person is “constantly negative. You know they’re going to show up [and] they’re going to bring the problem, never the solution. I like people who bring the problem and a suggestion for how they might resolve [it.]”

A “Debbie Downer” can also be someone who’s a naysayer, sharing negative opinions about others’ ideas and goals, or regularly being a hindrance to new projects and perspectives. This could make it difficult for them to make the connections needed to climb the corporate ladder, or for their bosses and managers to trust them with new projects.

If your co-worker has this character trait, they’re “only going to support you to a restricted limit,” Juliette Han, a Harvard-trained neuroscientist, told CNBC Make It in June 2023. “They need you to stay within a short leash, and might discourage you from meeting new people in the company or going after new projects if it doesn’t benefit them directly.”