Without any qualms of conscience; not feeling guilty for one's misdeeds.

plural of conscience round

A blank round of ammunition issued to one or more members of a firing squad without telling them, so that each person in the squad knows there is a chance that they themselves did not fire the lethal shot.

making somebody feel guilty.

Alternative form of in all conscience

(obsolete) Alternative form of in conscience

(religion) A review of one's thoughts, words, actions, and omissions for the purpose of ascertaining their conformity with, or deviation from, the moral law.

To give one's frank and honest opinion.