The word "most mortified" refers to a feeling of extreme embarrassment or shame. Its antonyms include "proud," "confident," "assured," and "self-assured." These words denote a sense of self-assurance, satisfaction and pride in one's actions, and a lack of insecurity or embarrassment. A person who is proud has confidence in their abilities and achievements, whereas someone who is most mortified is deeply regretful of their actions. "Confident" implies certainty and assurance, while "assured" suggests a sense of trust and reliability. "Self-assured" denotes a calm and confident self-belief, which is the polar opposite of feeling mortified.