Shaquil Barrett isn't reconsidering his decision to retire ... telling TMZ Sports he's done with football -- and NFL teams don't need to waste their time trying to change his mind.
The two-time Super Bowl champ made it clear this week after announcing his decision ... even though he worked out with the Indianapolis Colts just over a month ago.
"I'm not really chasing the NFL dream anymore, so I'm not just gonna be out there doin' NFL workouts every day to stay ready because I'm not that hungry for it anymore," Barrett said.