NEW YORK (CNNMoney.com) -- Everybody's got their insecurities. But some folks are ruled by theirs. When your boss is one of them, his insecurities will rule your day ... and your career prospects.

"Insecurity is one of the most common causes of managers behaving oddly," said Shaun Belding, author of "Winning With the Boss From Hell." "You're never quite sure what to expect from them."

Well, maybe there is one thing: They'll do anything to make themselves feel better, even if it's at your expense.

Your best-case scenario: you manage to become a trusted ally because you learn to contort your actions and comments to soothe el jefe's quivering sense of self.

Your worst-case scenario: You're perceived as a threat no matter what you do and you get fired.

That happened to one woman I know whose considerable marketing talents, popularity with colleagues and ability to communicate well with top management drove her direct manager up a tree.

The manager would schedule meetings on days she knew her charge wouldn't be there, let her employee do what she did best but then take credit for her work, and eventually convinced new management to oust her, despite the fact that she over-delivered on her numbers and was a top performer.

"You felt the manager always wanted to throw you under the bus at every turn," the fired woman said.

A friend's acquaintance had a similar experience. He had a boss at a start-up who used his football-player brawn to intimidate and book knowledge to paper over his lack of real-world experience. The manager reassigned him to three new markets to sell the company's services despite the fact that the boss couldn't explain why he thought those markets could be money-makers for the company. When asked, he told his employee, "That's an unfair question." Then later he told him to figure out the potential for himself.

"He was trying to make me unsuccessful and inherit my pipeline deals so he could get credit for making the sales," my friend's acquaintance said.

Of course, not all insecure bosses are so obvious or spiteful. But even the nicest of them can kill productivity and morale and push good employees out the door, said Rich Wellins, senior vice president of human-resource consulting firm Development Dimensions International.

Driven by fear, envy or just serious self-doubt, a boss's insecurities can manifest as:

Micromanaging: Bosses who are perfectionists, terrified of making a mistake, or terrified of losing their jobs will meddle, clogging up work flow.

Indecisiveness: Some bosses shy away from making the tough decisions -- particularly when it comes to getting rid of poor performers. That can drag down an otherwise strong team and garners the boss a reputation for being ineffective.

Hide and seek: The insecure boss isn't able to give a team a sense of purpose, tends not to be very visible with employees or customers and often hunkers down in his office.

Inability to give direction: You do what the guy once said he wanted, and now it turns out he wanted you to do something else. Worse, he wanted you to figure out that he wanted you to do something else and is angry that you haven't.

Overcompensating: Insecurity can be disguised by bullying, arrogance or power-mongering.

Since you can't choose your bosses, chances are good you'll end up working for a few during your career.

The absolute worst way to deal with them is to take credit for your successes without acknowledging them, or make your managers feel stupid in front of others by correcting them or questioning their decisions

But if you want to make the best of the situation, Belding and Wellins said, you might:

• Recognize that when your boss is indulging his insecurities at your expense -- say, screaming at you -- that it's not necessarily about you.
• Acknowledge your manager's contributions -- everyone likes recognition, especially insecure people.
• Let your boss know that you love your job and want to have a strong working relationship with her, and ask what you can do to make it better.
• Suggest ways to do things that will make your manager look like a hero. If your every move makes the boss look good, he just may become insecure about losing you.

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Jeanne Sahadi writes about personal finance for CNNMoney.com. For comments on this column or suggestions for future ones, please e-mail her at everydaymoney@cnnmoney.com.