Jactarse is to boast or brag. Note that it is reflexive. Therefore it is used like this: “he brags about himself.” Or, “he is a show-off.”
While it is similar to being proud (orgulloso), jactarse has a negative connotation where you can be proud in a negative or positive way.
Jactarse is a verb where orgulloso is an adjective.
[…] verb form of the word is fanfarronear and means to boast, brag or show […]