1. "It's not fair"
Everyone knows that life isn't fair. Saying it's not fair suggests that you think life is supposed to be fair, which makes you look immature and naïve. If you don't want to make yourself look bad, you could say, "I noticed that you assigned Ann that big project I was hoping for. Would you mind telling me what went into that decision? I'd like to know why you thought I wasn't a good fit, so that I can work on improving those skills."
2. "This is the way it's always been done"
Technology-fueled change is happening so fast that even a six-month-old process could be outdated. Saying this is the way it's always been done not only makes you sound lazy and resistant to change, but it could make your boss wonder why you haven't tried to improve things on your own. If you really are doing things the way they've always been done, there's almost certainly a better way.
3. "He's lazy/incompetent/a jerk"
There will always be rude orincompetent people in any workplace, and chances are that everyone knows who they are. If you don't have the power to help them improve or to fire them, then you have nothing to gain by broadcasting their ineptitude. Announcing your colleague's incompetence comes across as an insecure attempt to make you look better. Your callousness will inevitably come back to haunt you in the form of your coworkers' negative opinions of you.
4. "That's not in my job description"
This often sarcastic phrase makes you sound as though you're only willing to do the bare minimum required to keep getting a paycheck, which is a bad thing if you like job security.If your boss asks you to do something that you feel is inappropriate for your position, the best move is to complete the task eagerly. Later, schedule a conversation with your boss to discuss your role in the company and whether your job description needs an update. This ensures that you avoid looking petty. It also enables you and your boss to develop a long-term understanding of what you should and shouldn't be doing.
5. "I hate this job"
The last thing anyone wants to hear at work is someone complaining about how much they hate their job. Doing so labels you as a negative person and brings down the morale of the group. Bosses are quick to catch on to naysayers who drag down morale, and they know that there are always enthusiastic replacements waiting just around the corner.