The word "indictable" means something that can be charged or accused of an offense or crime. Thus, the antonyms for "most indictable" would be words that denote innocence or lack of guilt, such as blameless, faultless, impeccable, innocent, irreproachable, and guiltless. These words describe individuals or things that are not liable for any legal charges, accusations, or offenses, and thus, are completely innocent. While the term "most indictable" suggests that a particular individual or thing is likely to be condemned or found guilty in a court of law, its antonyms imply the opposite and depict a state of moral integrity and innocence.