The problem with saying the wrong thing to your boss is that you can never undo it. Here are four things you should keep to yourself:
An automatic “No.” When your boss asks you to take on a new responsibility or puts something else on your overflowing plate, never say “No.” At least, not at first. Listen, ask questions — then, if you still have concerns, explain them fully.
“I tried to warn you about that.” No one likes to hear, “I told you so.” Especially not a manager. Always give your boss a way to “save face.” Instead of emphasizing the mistake, ask, “What can I do to help?”
Anything that ends with “But.” It negates everything you said before it. “I’m sorry I didn’t get my report in on time, but…” alerts your boss that you’re about to offer an excuse. Try this instead: “I’m sorry my report was late and the next one will be on time.”
“That won’t work.” When your boss presents an idea, obviously she thinks it’s good. Take time to listen and you just might find out that your manager has thought through your objections and has already come up with solutions.