"Radical honesty" refers to being completely truthful, even when it may be uncomfortable or difficult. It means expressing your thoughts, feelings, and opinions openly and honestly, without sugarcoating or hiding anything. Full definition
To free yourself from the burden of secrets and lies, you must cultivate the skill of radical honesty: willingness to reveal any truth, no matter how «unacceptable» it is. (crunchydomesticgoddess.com)
Twelve - step groups, with their egalitarian model of leadership and emphasis on radical honesty, serve as training grounds for those in the kitchen cabinet. (religion-online.org)