The word "viperish" refers to someone who is snakelike and venomous. Therefore, antonyms for "most viperish" could include traits such as friendly, kind, gentle, and compassionate. Alternatively, words like trustworthy, reliable, and honest could also be antonyms, as they describe people who are not deceitful or sneaky. Other antonyms might include words like generous, amicable, good-natured, and sincere. These words all suggest positive qualities that are the opposite of viperish behaviour. It's important to remember that antonyms describe opposite concepts, so anything that is not associated with being viperish could be considered an antonym.