Davante Adams' no good 2023 season got a whole lot worse on Monday night ... and the star receiver couldn't hide his frustration with it anymore -- slamming his helmet in disgust on the sidelines.
The 30-year-old -- who's complained several times this year about his role in Las Vegas' offense -- caught just one pass during the Raiders' 26-14 loss to the Lions ... and he was clearly livid with the situation, melting down on his team's bench as the final seconds of the game ticked off.
First, he hurled his helmet with two hands into the ground.