Swelled-headednesses is a word used to describe someone who is excessively proud or arrogant. A synonym for this word is egotism or self-importance. Other words that can be used to convey this same meaning include conceit, narcissism, haughtiness, pomposity, and hubris. Each of these words describes an individual who is overly self-assured and believes they are superior to others. These words can be used in different contexts, whether it be in personal or professional settings, to describe someone who exhibits this negative behavior. In conclusion, swelled-headednesses can be expressed through various words, but they all depict the same characteristic - excessive self-importance.