A question I get regularly, “What do I say to a bad boss?”
First, separate the person from the problem. It’s not the leader that is bad, it is their behaviour that needs improvement (in your opinion).
Start by visualizing a positive result, and that good intention locked into your mind will bring the right words to you.
Use ‘I’ statements, rather than ‘You’ statements.
Right way: I feel that … The way I see this situation is … I notice … I wonder if …. I was thinking that …
Wrong way: You always … You never … Because of you … Your leadership style causes …
Read more about mastering the conflict conversation at PennyTremblay.com