not pull any punches
To speak truthfully, without brown nosing or without being patronizing or without being sensitive and kind.
Susan did not pull any punches when she told Bobby what she thought of him running over her brother in the living room when Bobby was drunk and high on drugs and put the car in drive instead of reverse.

Yea, she tends to use a sledge hammer and nail to driver her point in. 

I guess she figures it will stick to him that way.