Ron Jaworski says it's evident Tom Brady's in decline ... 'cause the football analyst says it's obvious the Patriots legend has lost strength in his throwing arm.
"Watching tape and watching games on TV, I think there's a little bit lost in his fastball," Jaws tells TMZ Sports.
The ex-Eagles QB says it's most apparent when Brady throws the deeper balls -- 'cause Ron is seeing a whole lot more rainbow passes than TB12's normal line drives.
"He's missing throws that I see him normally make .