Synonyms for the word "unheinous" can be described as virtuous, blameless, or innocent. These terms portray the absence of wrongdoing, suggesting a person's pure intentions and actions. Another synonym is righteous, evoking a sense of moral uprightness and ethical behavior. Moreover, the word immaculate can be a suitable alternative, emphasizing the absence of any stain or blemish. Similarly, the word irreproachable can be used, emphasizing the inability to find any fault or reproachfulness. In essence, these synonyms depict a person or an act as impeccable, commendable, and untarnished by any wrongdoing, showcasing the noblest qualities of humanity.