en_tn/jer/48/29.md

We have heard

Here "We" refers generally to all the people in the surrounding area.

arrogance ... haughtiness ... pride ... self-glory ... conceit in his heart

All of these words have similar meanings. They are used together to emphasize the extreme pride of the people of Moab.

the conceit in his heart

Here "heart" represents a person's inner being. Alternate translation: "his conceit" (See: rc://en/ta/man/translate/figs-metonymy)