LeBron James is straight-up PISSED that one of his NBA rivals lost a great player ... dropping an F-bomb when he learned Spurs baller Dejounte Murray was done for the season.
Murray's right knee buckled as he went up for a layup against the Rockets in San Antonio's preseason game Sunday ... and the team announced Monday he suffered a torn ACL.
Bron wasn't the least bit pleased to know one of his Western Conference rivals took that big of a blow, saying, "Man I feared that would be the case when I saw the play!