The most common antonyms for "most pardoning" include "unforgiving," "vindictive," "harsh," and "punitive." While someone who is "most pardoning" is likely to be forgiving and understanding, an individual who is "unforgiving" holds grudges and may refuse to show mercy or compassion. Similarly, a "vindictive" person seeks revenge and is often cruel, while someone who is "harsh" is tough and critical. Finally, a "punitive" individual is inclined to punish and may not be inclined to show leniency or mercy. Understanding these antonyms can help you better articulate the nuances and connotations of the term "most pardoning.