Maybe you love your job on paper, but in reality something is dragging you down. And that something is the person in the cubicle a few feet from your own. Most job descriptions don't account for the amount time we devote to workplace dynamics—whether that means withstanding foul lunch odors emanating from the office microwave or worrying about your boss's overuse of exclamation points in an email. But those are just minor issues compared to the burden a toxic coworker.

You know when one is in your midst—they slow down your progress, put a damper on your positive approach to a project or just make you feel like you need to watch your back 24/7.

It's not about a clash of personalities or a difficult person you can try to overlook. True toxic coworkers can poison the well of productivity and even muscle you out of your position. A study by Harvard Business School researchers recently found that toxic behavior in the workplace caused stress for their coworkers, lessended productivity and prompt "other employees to leave an organization faster and more frequently," according to the Harvard Gazette.

So what qualifies as toxic behavior and how do you put a stop to it before it spirals out of control? According to HBS researchers, certain character traits like extreme selfishness, overconfidence, too much risk-taking or an emphatic enforcement of rules, could all be predictors of the kind of coworker you want to avoid. To further break it down, we rounded up the three worst types of toxic coworkers and what to do about them.

The Rumormonger

Signature Moves:

Gossiping about coworkers, fishing for intel that crosses personal boundaries, spreading unreliable information about the company and its employees.

How To Shut It Down:

Gossiping and spreading rumors is one of the hallmarks of toxic workplace behavior, according to research published in the Harvard Business Review. While often rooted in insecurity and a need for control, these kinds of coworkers are masters of contagion, creating an environment of paranoia that can be paralyzing.

Sara Stanizai, the founder of Prospect Therapy, suggests keeping your personal life personal when confronted with such colleagues. "It might not mean that you're necessarily limiting what you share, but you're proactively thinking about how you want to present yourself to others," Stanizai summarized in her advice to Girlboss. "In this way, you'll safeguard yourself against potential rumors, and possible preconceived notions about your capabilities."

Still, when confronted with a rumormonger looking for a scoop, shutting it down can be awkward. The Muse's Lea Mcleod, a career coach, has a solution. "Gossip mongers often have little regard for fact," she writes. "So, when I hear something outrageous or questionable, I push for real answers."

She might respond to gossip by saying "Oh, wow, that sounds pretty extreme. Is that a fact? Or did you hear that from someone?." The result? "You'll quickly set the expectation that you won't engage in frivolous chatter that's not based in fact," explains Mcleod. "In turn, gossips will likely steer clear of you because asking for facts takes all the fun out of it for them."

The Downer

Signature Moves: Focusing on the negative aspects of the job, constantly shutting down ideas and creating obstacles at every turn.

How To Shut It Down:

Much like The Rumormonger, The Downer's toxicity can be contagious. You may find yourself lacking motivation or the drive for creative workarounds because all you can think is "What's the point?" This line of thinking can leave you in a job rut that wouldn't otherwise exist, threatening your productivity, communication skills and, ultimately, your employment.

"Don't give in and chime in with your negativity, but rather be friendly and keep conversations light with this person," Jennifer Lee Magas, vice president of Magas Media Consultants, LLC, tells Monster.com. "While you might initially feel obligated to lend an ear, associating yourself too closely with this person can give you a bad reputation at work."

But how do you keep the negativity from seeping into your brain subconsciously? Stanford professor and organizational psychologist Robert Sutton discovered a clever tactic. "There are mind tricks to protect your soul — ways for the situation to be less upsetting to you even though you can't change it," he explains in Stanford Business School's Insights. "My favorite is a guy at Stanford who pretends that he's a doctor who studies 'a-hole-ism.'" The idea is to create a detachment from the toxic behavior, so that you become an observer of a strange environment—a kind of field researcher—who isn't emotionally impacted by the culture you're studying.

The Backstabber

Signature Moves: Smiling to your face and criticizing you behind your back, encouraging your ideas in private and dismissing them in meetings, generally trying to sabotage you through gaslighting.

How To Shut It Down: Backstabbers are hard to initially spot. They disarm you with kindness, earn your trust and then pounce. Usually, they're just threatened, insecure and hellbent on eliminating the competition. This type of workplace jerk may seem insurmountable but they usually have one weakness: confrontation. They're inherently dishonest, so their fear of being caught in a lie or faced with someone who sees right through them can prompt them to back off ASAP.

With that in mind, workplace advice author Abby Curnow-Chavez suggests having "an honest, candid conversation with the person." You don't need to attack or go on the defense. Instead, try a measured approach. "Focus on the impact the behavior is having on you," Curnow-Chavez writes in HBR. "Ask for feedback on your own behavior as well." This will throw them off guard and force them to examine why they're so threatened by you. If nothing else, you will have made an attempt to right the situation. Keep a record of this. "When you are having ongoing problems with someone, it's important to document what's taking place," career expert Sue Morem tells CBSNews. "Keep a journal/notes of conversations and keep copies of e-mails, voice mails, or any other communication should you need to prove your case in the future."

You don't have to be dragged down by one bad egg. If someone is messing with your workplace culture, your productivity or your sanity, the best thing you can do is steer clear of the toxic spillover.

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