When it comes to identifying who is to blame, there are a variety of alternative phrases that can be used in place of "is at fault." Some possible synonyms include: responsible, culpable, accountable, guilty, at fault, liable, blameworthy, answerable, in the wrong, accountable, and in error. Each of these expressions conveys a different shade of meaning and can be used in various contexts depending on the circumstances. Whether it's in personal or professional settings, knowing these alternatives can help us better articulate our thoughts and take ownership of our actions.