Conceit is a term used to describe someone who has an excessively high opinion of themselves and their abilities. There are various synonyms that can be used to convey the same meaning as "with conceit." Egotistically, arrogantly, and pompously all describe someone who thinks highly of themselves, often to the point of being overly self-centered. Narcissistic, haughtily, and vainly are also words that can be used to express the same sentiment. These synonyms are commonly used to describe individuals who possess a sense of superiority over others and believe themselves to be better than everyone else.