Merriam-Webster Collegiate Dictionary - blameworthy

 adjective  Date: 14th century being at fault ; deserving blame  • blameworthiness noun Synonyms:  ~, blamable, guilty, culpable mean deserving reproach or punishment. ~ and blamable apply to any degree of reprehensibility conduct adjudged ~ an accident for which no one is blamable. guilty implies responsibility for or consciousness of crime, sin, or, at the least, grave error or misdoing guilty of a breach of etiquette. culpable is weaker than guilty and is likely to connote malfeasance or errors of ignorance, omission, or negligence culpable neglect.