The word unassertiveness refers to a lack of confidence and boldness when expressing one's opinion or standing up for oneself. Its antonyms are words that denote assertiveness, strength, and self-assurance. Some common antonyms for unassertiveness are terms like confidence, boldness, assertiveness, brazenness, audacity, courage, firmness, determination, resilience, and grit. An assertive person knows what they want, communicates their thoughts and feelings confidently, and does not hesitate to take appropriate action if necessary. Consequently, being confident and assertive can improve one's personal and professional life and lead to greater success and happiness.