Antonyms for the word "more nasty-tempered" could include "calm," "gentle," "kind," "pleasant," "agreeable," and "amiable." These words describe traits of individuals who are not easily angered, frustrated or ill-tempered. As opposed to those who are more nasty-tempered, these individuals often exhibit equanimity, patience, and are tolerant of others. They are great listeners, empathetic, and possess excellent communication skills. They are not quick to judge, and they take the time to understand people and situations before making a decision. They project positivity and are great at diffusing tension and calming people down. Ultimately, they have a good influence on everyone around them.