The term "self-assuming" refers to a person who exhibits overconfidence, arrogance, and assumes that they possess certain qualities or abilities without evidence or proof. Some synonyms for this term include presumptuous, conceited, cocky, haughty, narcissistic, egotistical, self-important, and superior. All these terms portray a personality that is overly confident and lacks humility. These characteristics can be off-putting to others, and it is crucial to strike a balance between self-assurance and arrogance. Using these synonyms can help you better describe a person who possesses self-assuming traits, and it is essential to keep in mind that these traits are not attractive to most people.