Which word describes pride in one's appearance or qualities, possibly to an excessive degree?

The word that describes pride in one's appearance or qualities, possibly to an excessive degree, is "vain." This term specifically refers to individuals who have an inflated sense of self-importance or show excessive pride in their looks or accomplishments. It implies that a person may be overly concerned with their image or how they are perceived by others, often leading to a lack of humility.

In contrast, "humble" refers to having a modest or low view of one's importance, which is the opposite of what vanity implies. "Timid" describes someone who is shy or lacking in confidence, and does not relate to pride at all. "Modest" conveys a sense of humility and lack of arrogance, indicating a balanced and restrained sense of self-worth rather than an excessive pride in oneself. Thus, "vain" is the most accurate description for the excessive pride in appearance or qualities.