The antonyms for "un-assertiveness" are words that describe the opposite of that trait, such as assertiveness, confidence, aggressiveness, boldness, and dominance. Assertiveness refers to a person's ability to express their opinions, needs, and wants clearly and confidently without being aggressive. Confidence is the feeling of self-assurance and trust in oneself, which helps people take risks and make decisions without fear. Aggressiveness is the temperament that communicates power craving, superiority, and potentially harmful behavior. Boldness is the quality of being daring and fearless in the face of uncertainty. Dominance is the characteristic of controlling or leading others, showing a sense of authority and influence.