What word indicates a tendency to boast excessively about accomplishments or possessions?

The term "conceit" specifically refers to an excessive pride in oneself, particularly regarding accomplishments or possessions. It often suggests an inflated sense of one's abilities or worth, leading to the tendency to boast or brag. This aligns directly with the question, as it captures the essence of overindulging in self-praise and the presentation of one's achievements in an exaggerated manner.

In contrast, "hubris" typically refers to an extreme pride that often leads to one’s downfall and isn't exclusively about boasting; it has a broader context related to arrogance. "Bravado" involves a display of boldness or courage, which may not convey a sense of boasting about accomplishments specifically. "Vanity" is focused more on an excessive belief in one's attractiveness or abilities, which can include self-importance, but does not inherently carry the same connotation of boasting about achievements or possessions. Therefore, "conceit" is the most accurate choice given its direct association with boasting.